{
 "instance": {
  "nghc-20200930.htm": {
   "axisCustom": 3,
   "axisStandard": 25,
   "contextCount": 778,
   "dts": {
    "calculationLink": {
     "local": [
      "nghc-20200930_cal.xml"
     ]
    },
    "definitionLink": {
     "local": [
      "nghc-20200930_def.xml"
     ],
     "remote": [
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-eedm-def-2019-01-31.xml",
      "http://xbrl.fasb.org/srt/2019/elts/srt-eedm1-def-2019-01-31.xml"
     ]
    },
    "inline": {
     "local": [
      "nghc-20200930.htm"
     ]
    },
    "labelLink": {
     "local": [
      "nghc-20200930_lab.xml"
     ],
     "remote": [
      "https://xbrl.sec.gov/dei/2020/dei-doc-2020-01-31.xml",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-doc-2019-01-31.xml"
     ]
    },
    "presentationLink": {
     "local": [
      "nghc-20200930_pre.xml"
     ]
    },
    "referenceLink": {
     "remote": [
      "https://xbrl.sec.gov/dei/2020/dei-ref-2020-01-31.xml",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-ref-2019-01-31.xml"
     ]
    },
    "schema": {
     "local": [
      "nghc-20200930.xsd"
     ],
     "remote": [
      "http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd",
      "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xl-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xlink-2003-12-31.xsd",
      "http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd",
      "http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd",
      "http://www.xbrl.org/2005/xbrldt-2005.xsd",
      "http://www.xbrl.org/2006/ref-2006-02-27.xsd",
      "http://xbrl.fasb.org/srt/2019/elts/srt-types-2019-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-roles-2019-01-31.xsd",
      "http://xbrl.fasb.org/srt/2019/elts/srt-roles-2019-01-31.xsd",
      "https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-types-2019-01-31.xsd",
      "https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd",
      "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-parts-codification-2019-01-31.xsd",
      "http://www.xbrl.org/lrr/role/deprecated-2009-12-16.xsd"
     ]
    }
   },
   "elementCount": 673,
   "entityCount": 1,
   "hidden": {
    "http://xbrl.sec.gov/dei/2020-01-31": 6,
    "total": 6
   },
   "keyCustom": 36,
   "keyStandard": 426,
   "memberCustom": 57,
   "memberStandard": 57,
   "nsprefix": "nghc",
   "nsuri": "http://www.nationalgeneral.com/20200930",
   "report": {
    "R1": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "document",
     "isDefault": "true",
     "longName": "0001001 - Document - Document and Entity Information Statement",
     "role": "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement",
     "shortName": "Document and Entity Information Statement",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R10": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:AllowanceForCreditLossesTextBlock",
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AllowanceForCreditLossesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2106103 - Disclosure - Allowance for Expected Credit Losses",
     "role": "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLosses",
     "shortName": "Allowance for Expected Credit Losses",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:AllowanceForCreditLossesTextBlock",
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AllowanceForCreditLossesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R11": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InvestmentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2110104 - Disclosure - Investments",
     "role": "http://www.nationalgeneral.com/role/Investments",
     "shortName": "Investments",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InvestmentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R12": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2127105 - Disclosure - Fair Value of Financial Instruments",
     "role": "http://www.nationalgeneral.com/role/FairValueofFinancialInstruments",
     "shortName": "Fair Value of Financial Instruments",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueDisclosuresTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R13": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DeferredPolicyAcquisitionCostsTextBlock1",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2132106 - Disclosure - Deferred Acquisition Costs",
     "role": "http://www.nationalgeneral.com/role/DeferredAcquisitionCosts",
     "shortName": "Deferred Acquisition Costs",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DeferredPolicyAcquisitionCostsTextBlock1",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R14": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LiabilityForFuturePolicyBenefitsAndUnpaidClaimsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2135107 - Disclosure - Unpaid Losses and Loss Adjustment Expense Reserves",
     "role": "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReserves",
     "shortName": "Unpaid Losses and Loss Adjustment Expense Reserves",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LiabilityForFuturePolicyBenefitsAndUnpaidClaimsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R15": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ReinsuranceTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2138108 - Disclosure - Reinsurance",
     "role": "http://www.nationalgeneral.com/role/Reinsurance",
     "shortName": "Reinsurance",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ReinsuranceTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R16": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2142109 - Disclosure - Debt",
     "role": "http://www.nationalgeneral.com/role/Debt",
     "shortName": "Debt",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R17": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2151110 - Disclosure - Contingencies",
     "role": "http://www.nationalgeneral.com/role/Contingencies",
     "shortName": "Contingencies",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R18": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:IncomeTaxDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2152111 - Disclosure - Income Taxes",
     "role": "http://www.nationalgeneral.com/role/IncomeTaxes",
     "shortName": "Income Taxes",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:IncomeTaxDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R19": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2154112 - Disclosure - Stockholders' Equity",
     "role": "http://www.nationalgeneral.com/role/StockholdersEquity",
     "shortName": "Stockholders' Equity",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R2": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesDebtSecurities",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1001002 - Statement - Condensed Consolidated Balance Sheets",
     "role": "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
     "shortName": "Condensed Consolidated Balance Sheets",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:Investments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R20": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2160113 - Disclosure - Stock-Based Compensation",
     "role": "http://www.nationalgeneral.com/role/StockBasedCompensation",
     "shortName": "Stock-Based Compensation",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R21": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:EarningsPerShareTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2165114 - Disclosure - Earnings Per Share",
     "role": "http://www.nationalgeneral.com/role/EarningsPerShare",
     "shortName": "Earnings Per Share",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:EarningsPerShareTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R22": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2168115 - Disclosure - Related Party Transactions",
     "role": "http://www.nationalgeneral.com/role/RelatedPartyTransactions",
     "shortName": "Related Party Transactions",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RelatedPartyTransactionsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R23": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SegmentReportingDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2171116 - Disclosure - Segment Information",
     "role": "http://www.nationalgeneral.com/role/SegmentInformation",
     "shortName": "Segment Information",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SegmentReportingDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R24": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BasisOfAccountingPolicyPolicyTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2203201 - Disclosure - Recent Accounting Pronouncements (Policies)",
     "role": "http://www.nationalgeneral.com/role/RecentAccountingPronouncementsPolicies",
     "shortName": "Recent Accounting Pronouncements (Policies)",
     "subGroupType": "policies",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:BasisOfAccountingPolicyPolicyTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R25": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2304301 - Disclosure - Recent Accounting Pronouncements (Tables)",
     "role": "http://www.nationalgeneral.com/role/RecentAccountingPronouncementsTables",
     "shortName": "Recent Accounting Pronouncements (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R26": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PremiumReceivableAllowanceForCreditLossTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2307302 - Disclosure - Allowance for Expected Credit Losses (Tables)",
     "role": "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesTables",
     "shortName": "Allowance for Expected Credit Losses (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PremiumReceivableAllowanceForCreditLossTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R27": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2311303 - Disclosure - Investments (Tables)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsTables",
     "shortName": "Investments (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R28": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueByBalanceSheetGroupingTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2328304 - Disclosure - Fair Value of Financial Instruments (Tables)",
     "role": "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsTables",
     "shortName": "Fair Value of Financial Instruments (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueByBalanceSheetGroupingTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R29": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DeferredPolicyAcquisitionCostsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2333305 - Disclosure - Deferred Acquisition Costs (Tables)",
     "role": "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsTables",
     "shortName": "Deferred Acquisition Costs (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DeferredPolicyAcquisitionCostsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R3": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:AvailableForSaleSecuritiesTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1002003 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)",
     "role": "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
     "shortName": "Condensed Consolidated Balance Sheets (Parenthetical)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i8bbb0947a28b42bf9d15837124492b36_I20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R30": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2336306 - Disclosure - Unpaid Losses and Loss Adjustment Expense Reserves (Tables)",
     "role": "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesTables",
     "shortName": "Unpaid Losses and Loss Adjustment Expense Reserves (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R31": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "nghc:ScheduleofReinsuranceRecoverableTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2339307 - Disclosure - Reinsurance (Tables)",
     "role": "http://www.nationalgeneral.com/role/ReinsuranceTables",
     "shortName": "Reinsurance (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "nghc:ScheduleofReinsuranceRecoverableTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R32": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDebtInstrumentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2343308 - Disclosure - Debt (Tables)",
     "role": "http://www.nationalgeneral.com/role/DebtTables",
     "shortName": "Debt (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDebtInstrumentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R33": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "nghc:PreferredStockTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2355309 - Disclosure - Stockholders' Equity (Tables)",
     "role": "http://www.nationalgeneral.com/role/StockholdersEquityTables",
     "shortName": "Stockholders' Equity (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "nghc:PreferredStockTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R34": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2361310 - Disclosure - Stock-Based Compensation (Tables)",
     "role": "http://www.nationalgeneral.com/role/StockBasedCompensationTables",
     "shortName": "Stock-Based Compensation (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R35": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2366311 - Disclosure - Earnings Per Share (Tables)",
     "role": "http://www.nationalgeneral.com/role/EarningsPerShareTables",
     "shortName": "Earnings Per Share (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R36": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2372312 - Disclosure - Segment Information (Tables)",
     "role": "http://www.nationalgeneral.com/role/SegmentInformationTables",
     "shortName": "Segment Information (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R37": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i85713ae3d75d452699439c7ada49f6df_I20191231",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2405401 - Disclosure - Recent Accounting Pronouncements (Details)",
     "role": "http://www.nationalgeneral.com/role/RecentAccountingPronouncementsDetails",
     "shortName": "Recent Accounting Pronouncements (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R38": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:PremiumReceivableAllowanceForCreditLossTableTextBlock",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PremiumsAndOtherReceivablesNet",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2408402 - Disclosure - Allowance for Expected Credit Losses - Premiums and Other receivables - Changes In Allowance for Expected Credit Losses (Details)",
     "role": "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesPremiumsandOtherreceivablesChangesInAllowanceforExpectedCreditLossesDetails",
     "shortName": "Allowance for Expected Credit Losses - Premiums and Other receivables - Changes In Allowance for Expected Credit Losses (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:PremiumReceivableAllowanceForCreditLossTableTextBlock",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3fff6130e893489b9bacd4a6405f3888_I20200630",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:PremiumsReceivableAllowanceForDoubtfulAccounts",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R39": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ReinsuranceRecoverablesOnPaidAndUnpaidLosses",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2409403 - Disclosure - Allowance for Expected Credit Losses - Reinsurance Recoverable - Changes In Allowance for Expected Credit Losses (Details)",
     "role": "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesReinsuranceRecoverableChangesInAllowanceforExpectedCreditLossesDetails",
     "shortName": "Allowance for Expected Credit Losses - Reinsurance Recoverable - Changes In Allowance for Expected Credit Losses (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ReinsuranceRecoverableAllowanceForCreditLossTableTextBlock",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:ReinsuranceRecoverableCreditLossExpenseReversal",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R4": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PremiumsEarnedNet",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1003004 - Statement - Condensed Consolidated Statements of Income",
     "role": "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
     "shortName": "Condensed Consolidated Statements of Income",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:Revenues",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R40": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:AvailableForSaleSecuritiesTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesAmortizedCost",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2412404 - Disclosure - Investments - Available-for-Sale Debt Securities (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
     "shortName": "Investments - Available-for-Sale Debt Securities (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:AvailableForSaleSecuritiesTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R41": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2413405 - Disclosure - Investments - Available-for-Sale Debt Securities by Contractual Maturity (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails",
     "shortName": "Investments - Available-for-Sale Debt Securities by Contractual Maturity (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R42": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2414406 - Disclosure - Investments - Gross Unrealized Losses (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails",
     "shortName": "Investments - Gross Unrealized Losses (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i85713ae3d75d452699439c7ada49f6df_I20191231",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R43": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3fff6130e893489b9bacd4a6405f3888_I20200630",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2415407 - Disclosure - Investments - Allowance For Credit Losses (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsAllowanceForCreditLossesDetails",
     "shortName": "Investments - Allowance For Credit Losses (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R44": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:InvestmentIncomeTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:GrossInvestmentIncomeOperating",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2416408 - Disclosure - Investments - Investment Income (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
     "shortName": "Investments - Investment Income (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:InvestmentIncomeTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:GrossInvestmentIncomeOperating",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R45": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:GainLossOnInvestmentsTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "nghc:OtherNetRealizedGainLossonInvestments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2417409 - Disclosure - Investments - Net Realized Gains (Losses) (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails",
     "shortName": "Investments - Net Realized Gains (Losses) (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:GainLossOnInvestmentsTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "nghc:OtherNetRealizedGainLossonInvestments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R46": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:AvailableForSaleSecuritiesTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesAmortizedCost",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2418410 - Disclosure - Investments - Credit Quality of Investments (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
     "shortName": "Investments - Credit Quality of Investments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "nghc:InvestmentsCreditQualityIndicatorsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "iaa8b1ec53d8a4665b0a2162a4e407d9e_I20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesAmortizedCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R47": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:AvailableForSaleSecuritiesTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecurities",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2419411 - Disclosure - Investments - Investment Quality of Corporate Bonds (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails",
     "shortName": "Investments - Investment Quality of Corporate Bonds (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "nghc:InvestmentsCreditQualityIndicatorsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88827c4057184fc29813ca465c2ab18e_I20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecurities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R48": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2420412 - Disclosure - Investments - Cash and Cash Equivalents, Restricted Cash and Restricted Investments (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsCashandCashEquivalentsRestrictedCashandRestrictedInvestmentsDetails",
     "shortName": "Investments - Cash and Cash Equivalents, Restricted Cash and Restricted Investments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:AssetsHeldByInsuranceRegulators",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R49": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherInvestments",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2421413 - Disclosure - Investments - Short-term and Other Investments (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails",
     "shortName": "Investments - Short-term and Other Investments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "nghc:OtherInvestmentsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i5a5c9b03b531457a92cac4d7896b635e_I20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:OtherInvestments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R5": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ProfitLoss",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1004005 - Statement - Condensed Consolidated Statements of Comprehensive Income",
     "role": "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome",
     "shortName": "Condensed Consolidated Statements of Comprehensive Income",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R50": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i1f58ab49ab7646218648741549c1c606_I20200930",
      "decimals": "2",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:EquityMethodInvestmentOwnershipPercentage",
      "reportCount": 1,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2422414 - Disclosure - Investments - Related Parties - LSC Entity (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
     "shortName": "Investments - Related Parties - LSC Entity (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i4e09390ca67946cdb9c1b6817b46c0a7_I20191231",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:EquityMethodInvestments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R51": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i80e55ef3a2b0442b81857399ecfdc397_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LeaseAndRentalExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2423415 - Disclosure - Investments - Related Parties - 800 Superior, LLC (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
     "shortName": "Investments - Related Parties - 800 Superior, LLC (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i80e55ef3a2b0442b81857399ecfdc397_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LeaseAndRentalExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R52": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "ib8b9cd050e344f04b4a509fdee393904_I20200930",
      "decimals": "2",
      "first": true,
      "lang": "en-US",
      "name": "nghc:LimitedPartnershipPercentageParticipation",
      "reportCount": 1,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2424416 - Disclosure - Investments - Related Parties - North Dearborn (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails",
     "shortName": "Investments - Related Parties - North Dearborn (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i5bddeb9d2ed64cd9b14d46b68bf0db40_I20191231",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:EquityMethodInvestments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R53": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "ia2fead9569b04971994cdc52db3b185f_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:EquityMethodInvestments",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2425417 - Disclosure - Investments - Related Parties - 4455 LBJ Freeway, LLC (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
     "shortName": "Investments - Related Parties - 4455 LBJ Freeway, LLC (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i9e8ead61aa914af9bab96416216f429b_I20191231",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:EquityMethodInvestments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R54": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "ib0390b7f3d484f8186b68c4387aef6a2_I20200930",
      "decimals": "3",
      "first": true,
      "lang": "en-US",
      "name": "nghc:LimitedPartnershipPercentageParticipation",
      "reportCount": 1,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2426418 - Disclosure - Investments - Related Parties - Illinois Center Building, L.P. (Details)",
     "role": "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
     "shortName": "Investments - Related Parties - Illinois Center Building, L.P. (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i07750af537a14331af9a987b709c3701_I20191231",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:EquityMethodInvestments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R55": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesDebtSecurities",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2429419 - Disclosure - Fair Value of Financial Instruments - Assets Measured on Recurring Basis (Details)",
     "role": "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
     "shortName": "Fair Value of Financial Instruments - Assets Measured on Recurring Basis (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:FairValueByBalanceSheetGroupingTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "ic355c532c8364ffd8ea96922a089e72f_I20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:AvailableForSaleSecuritiesDebtSecurities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R56": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "nghc:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i85713ae3d75d452699439c7ada49f6df_I20191231",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2430420 - Disclosure - Fair Value of Financial Instruments - Changes in Fair Value of Level 3 Financial Assets (Details)",
     "role": "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails",
     "shortName": "Fair Value of Financial Instruments - Changes in Fair Value of Level 3 Financial Assets (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "nghc:FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i85713ae3d75d452699439c7ada49f6df_I20191231",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R57": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LongTermDebt",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2431421 - Disclosure - Fair Value of Financial Instruments - Debt (Details)",
     "role": "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails",
     "shortName": "Fair Value of Financial Instruments - Debt (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i72c1525a36114a9bb035bf784afd1c10_I20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:LongTermDebt",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R58": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:DeferredPolicyAcquisitionCostsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i85713ae3d75d452699439c7ada49f6df_I20191231",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2434422 - Disclosure - Deferred Acquisition Costs (Details)",
     "role": "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails",
     "shortName": "Deferred Acquisition Costs (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:DeferredPolicyAcquisitionCostsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i85713ae3d75d452699439c7ada49f6df_I20191231",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R59": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i85713ae3d75d452699439c7ada49f6df_I20191231",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2437423 - Disclosure - Unpaid Losses and Loss Adjustment Expense Reserves (Details)",
     "role": "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails",
     "shortName": "Unpaid Losses and Loss Adjustment Expense Reserves (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i09b92be1d7624293a7be1ba03b958900_I20181231",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R6": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i09b92be1d7624293a7be1ba03b958900_I20181231",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1005006 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity",
     "role": "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity",
     "shortName": "Condensed Consolidated Statements of Changes in Stockholders' Equity",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i09b92be1d7624293a7be1ba03b958900_I20181231",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R60": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "nghc:ScheduleofReinsuranceRecoverableTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ReinsuranceRecoverablesOnPaidLossesGross",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2440424 - Disclosure - Reinsurance - Effects of Reinsurance (Details)",
     "role": "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails",
     "shortName": "Reinsurance - Effects of Reinsurance (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "nghc:ScheduleofReinsuranceRecoverableTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i85713ae3d75d452699439c7ada49f6df_I20191231",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:ReinsuranceRecoverablesOnPaidLossesGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R61": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "id9cbe53850d2447ab900e36413e1ebb7_D20200101-20200101",
      "decimals": "INF",
      "first": true,
      "lang": "en-US",
      "name": "nghc:ReinsurancePercentageofBusinessCeded",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2441425 - Disclosure - Reinsurance - Narrative (Details)",
     "role": "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails",
     "shortName": "Reinsurance - Narrative (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "id9cbe53850d2447ab900e36413e1ebb7_D20200101-20200101",
      "decimals": "INF",
      "first": true,
      "lang": "en-US",
      "name": "nghc:ReinsurancePercentageofBusinessCeded",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R62": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDebtInstrumentsTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NotesPayable",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2444426 - Disclosure - Debt - Debt Instruments (Details)",
     "role": "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
     "shortName": "Debt - Debt Instruments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDebtInstrumentsTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:FinanceLeaseLiability",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R63": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:InterestIncomeAndInterestExpenseDisclosureTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InterestExpenseDebt",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2445427 - Disclosure - Debt - Interest Expense (Details)",
     "role": "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
     "shortName": "Debt - Interest Expense (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:InterestIncomeAndInterestExpenseDisclosureTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InterestExpenseDebt",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R64": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:InterestIncomeAndInterestExpenseDisclosureTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "ia53dc38059324247abf768208ad35bd5_I20200930",
      "decimals": "INF",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtInstrumentInterestRateStatedPercentage",
      "reportCount": 1,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2446428 - Disclosure - Debt - Senior Notes (Details)",
     "role": "http://www.nationalgeneral.com/role/DebtSeniorNotesDetails",
     "shortName": "Debt - Senior Notes (Details)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R65": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDebtInstrumentsTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NotesPayable",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2447429 - Disclosure - Debt - Subordinated Debentures (Details)",
     "role": "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails",
     "shortName": "Debt - Subordinated Debentures (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "ia6aff8df531048f089e9749ed2740823_D20200101-20200930",
      "decimals": "INF",
      "lang": "en-US",
      "name": "us-gaap:DebtInstrumentRedemptionPricePercentage",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R66": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "iadd677bd93ea4304b72994ed54cfa651_D20200101-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2448430 - Disclosure - Debt - Credit Agreement (Details)",
     "role": "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
     "shortName": "Debt - Credit Agreement (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "iadd677bd93ea4304b72994ed54cfa651_D20200101-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R67": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2449431 - Disclosure - Debt - Debt Maturities (Details)",
     "role": "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
     "shortName": "Debt - Debt Maturities (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R68": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i2f0b209f218746908fed049907984bec_I20200930",
      "decimals": "2",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RatioOfIndebtednessToNetCapital1",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2450432 - Disclosure - Debt - Covenants and Compliance (Details)",
     "role": "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
     "shortName": "Debt - Covenants and Compliance (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i2f0b209f218746908fed049907984bec_I20200930",
      "decimals": "2",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RatioOfIndebtednessToNetCapital1",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R69": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:EffectiveIncomeTaxRateContinuingOperations",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2453433 - Disclosure - Income Taxes (Details)",
     "role": "http://www.nationalgeneral.com/role/IncomeTaxesDetails",
     "shortName": "Income Taxes (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:EffectiveIncomeTaxRateContinuingOperations",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R7": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ProfitLoss",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "1006007 - Statement - Condensed Consolidated Statements of Cash Flows",
     "role": "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows",
     "shortName": "Condensed Consolidated Statements of Cash Flows",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:ProvisionForDoubtfulAccounts",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R70": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:PreferredStockSharesOutstanding",
       "span",
       "div",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i85713ae3d75d452699439c7ada49f6df_I20191231",
      "decimals": "INF",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PreferredStockSharesIssued",
      "reportCount": 1,
      "unitRef": "shares",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2456434 - Disclosure - Stockholders' Equity - Preferred Stock (Details)",
     "role": "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails",
     "shortName": "Stockholders' Equity - Preferred Stock (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "nghc:PreferredStockTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i89c94c7c580e4b8c8a4a7146275e883c_I20191231",
      "decimals": "0",
      "lang": "en-US",
      "name": "us-gaap:PreferredStockSharesIssued",
      "reportCount": 1,
      "unique": true,
      "unitRef": "shares",
      "xsiNil": "false"
     }
    },
    "R71": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i928395d96a4d4e29bc050430e1781e65_D20200701-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DividendsPayableDateDeclaredDayMonthAndYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2457435 - Disclosure - Stockholders' Equity - Common and Preferred Stock Dividends (Details)",
     "role": "http://www.nationalgeneral.com/role/StockholdersEquityCommonandPreferredStockDividendsDetails",
     "shortName": "Stockholders' Equity - Common and Preferred Stock Dividends (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i928395d96a4d4e29bc050430e1781e65_D20200701-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DividendsPayableDateDeclaredDayMonthAndYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R72": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i1d4e4ae3979f4f1b8c9891d4ee41dde7_I20200429",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:StockRepurchaseProgramAuthorizedAmount1",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2458436 - Disclosure - Stockholders' Equity - Share Repurchase Program (Details)",
     "role": "http://www.nationalgeneral.com/role/StockholdersEquityShareRepurchaseProgramDetails",
     "shortName": "Stockholders' Equity - Share Repurchase Program (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i1d4e4ae3979f4f1b8c9891d4ee41dde7_I20200429",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:StockRepurchaseProgramAuthorizedAmount1",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R73": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfCommonStockOutstandingRollForwardTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3fff6130e893489b9bacd4a6405f3888_I20200630",
      "decimals": "INF",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommonStockSharesIssued",
      "reportCount": 1,
      "unique": true,
      "unitRef": "shares",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2459437 - Disclosure - Stockholders' Equity - Shares Rollforward (Details)",
     "role": "http://www.nationalgeneral.com/role/StockholdersEquitySharesRollforwardDetails",
     "shortName": "Stockholders' Equity - Shares Rollforward (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfCommonStockOutstandingRollForwardTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3fff6130e893489b9bacd4a6405f3888_I20200630",
      "decimals": "INF",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommonStockSharesIssued",
      "reportCount": 1,
      "unique": true,
      "unitRef": "shares",
      "xsiNil": "false"
     }
    },
    "R74": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "2",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:SharePrice",
      "reportCount": 1,
      "unitRef": "usdPerShare",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2462438 - Disclosure - Stock-Based Compensation - Stock Option Activity (Details)",
     "role": "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails",
     "shortName": "Stock-Based Compensation - Stock Option Activity (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "ie3a7537ab2f24ca88910f7e9ee367952_I20191231",
      "decimals": "INF",
      "lang": "en-US",
      "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber",
      "reportCount": 1,
      "unique": true,
      "unitRef": "shares",
      "xsiNil": "false"
     }
    },
    "R75": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i76a2551d9ae640a3b4a6710e8c2132b6_I20191231",
      "decimals": "INF",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber",
      "reportCount": 1,
      "unique": true,
      "unitRef": "shares",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2463439 - Disclosure - Stock-Based Compensation - RSU Activity (Details)",
     "role": "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails",
     "shortName": "Stock-Based Compensation - RSU Activity (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i76a2551d9ae640a3b4a6710e8c2132b6_I20191231",
      "decimals": "INF",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber",
      "reportCount": 1,
      "unique": true,
      "unitRef": "shares",
      "xsiNil": "false"
     }
    },
    "R76": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AllocatedShareBasedCompensationExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2464440 - Disclosure - Stock-Based Compensation - Narrative (Details)",
     "role": "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails",
     "shortName": "Stock-Based Compensation - Narrative (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AllocatedShareBasedCompensationExpense",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R77": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NetIncomeLoss",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2467441 - Disclosure - Earnings Per Share (Details)",
     "role": "http://www.nationalgeneral.com/role/EarningsPerShareDetails",
     "shortName": "Earnings Per Share (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R78": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OtherInvestments",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2469442 - Disclosure - Related Party Transactions - Credit Agreement with ACP Re (Details)",
     "role": "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails",
     "shortName": "Related Party Transactions - Credit Agreement with ACP Re (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "id08e2772cc954193ace6c659a6955f10_D20200101-20200930",
      "decimals": "INF",
      "lang": "en-US",
      "name": "nghc:DebtInstrumentCovenantMinimumLoantoValuePercent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "number",
      "xsiNil": "false"
     }
    },
    "R79": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i2e798c53258e4ca3a9201f227cec999f_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2470443 - Disclosure - Related Party Transactions - Other Related Party Transactions (Details)",
     "role": "http://www.nationalgeneral.com/role/RelatedPartyTransactionsOtherRelatedPartyTransactionsDetails",
     "shortName": "Related Party Transactions - Other Related Party Transactions (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i2e798c53258e4ca3a9201f227cec999f_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R8": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2101101 - Disclosure - Basis of Reporting",
     "role": "http://www.nationalgeneral.com/role/BasisofReporting",
     "shortName": "Basis of Reporting",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R80": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": "INF",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NumberOfOperatingSegments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "segment",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2473444 - Disclosure - Segment Information - Results of Operations of the Business Segments (Details)",
     "role": "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails",
     "shortName": "Segment Information - Results of Operations of the Business Segments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "div",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": "INF",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NumberOfOperatingSegments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "segment",
      "xsiNil": "false"
     }
    },
    "R81": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:PremiumReceivableAllowanceForCreditLossTableTextBlock",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PremiumsAndOtherReceivablesNet",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2474445 - Disclosure - Segment Information - Long Lived Assets and Total Assets of Business Segments (Details)",
     "role": "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails",
     "shortName": "Segment Information - Long Lived Assets and Total Assets of Business Segments (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i18a7173ba2ca4ceeb8f27049370b3b22_I20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:IntangibleAssetsNetIncludingGoodwill",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R82": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2475446 - Disclosure - Segment Information - Service and Fee Income (Details)",
     "role": "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails",
     "shortName": "Segment Information - Service and Fee Income (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R83": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PremiumsWrittenGross",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2476447 - Disclosure - Segment Information - Gross Premium Written (Details)",
     "role": "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
     "shortName": "Segment Information - Gross Premium Written (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i8a7f784c78044857a3182a8ac7cfc507_D20200701-20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:PremiumsWrittenGross",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R84": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "nghc:ScheduleOfSummaryOfPremiumsAndLossesCededTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PremiumsWrittenNet",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2477448 - Disclosure - Segment Information - Net Premium Written (Details)",
     "role": "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
     "shortName": "Segment Information - Net Premium Written (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i8a7f784c78044857a3182a8ac7cfc507_D20200701-20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:PremiumsWrittenNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R85": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PremiumsEarnedNet",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2478449 - Disclosure - Segment Information - Net Earned Premium (Details)",
     "role": "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
     "shortName": "Segment Information - Net Earned Premium (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i8a7f784c78044857a3182a8ac7cfc507_D20200701-20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "us-gaap:PremiumsEarnedNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R86": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InsuranceCommissionsAndFees",
      "reportCount": 1,
      "unitRef": "usd",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2479450 - Disclosure - Segment Information - Fee Income (Details)",
     "role": "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
     "shortName": "Segment Information - Fee Income (Details)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i88b5b02dfe4e48138dfbd5e0f6fab15e_D20200701-20200930",
      "decimals": "-3",
      "lang": "en-US",
      "name": "nghc:CedingCommissionandServiceandFeeIncome",
      "reportCount": 1,
      "unique": true,
      "unitRef": "usd",
      "xsiNil": "false"
     }
    },
    "R9": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock",
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "2102102 - Disclosure - Recent Accounting Pronouncements",
     "role": "http://www.nationalgeneral.com/role/RecentAccountingPronouncements",
     "shortName": "Recent Accounting Pronouncements",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock",
       "span",
       "div",
       "body",
       "html"
      ],
      "baseRef": "nghc-20200930.htm",
      "contextRef": "i3f7763d260e4437b98f44d80f5564c54_D20200101-20200930",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    }
   },
   "segmentCount": 124,
   "tag": {
    "dei_AmendmentFlag": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.",
        "label": "Amendment Flag",
        "terseLabel": "Amendment Flag"
       }
      }
     },
     "localname": "AmendmentFlag",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_CityAreaCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Area code of city",
        "label": "City Area Code",
        "terseLabel": "City Area Code"
       }
      }
     },
     "localname": "CityAreaCode",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_CoverAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Cover page.",
        "label": "Cover [Abstract]"
       }
      }
     },
     "localname": "CoverAbstract",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "xbrltype": "stringItemType"
    },
    "dei_CurrentFiscalYearEndDate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "End date of current fiscal year in the format --MM-DD.",
        "label": "Current Fiscal Year End Date",
        "terseLabel": "Current Fiscal Year End Date"
       }
      }
     },
     "localname": "CurrentFiscalYearEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "gMonthDayItemType"
    },
    "dei_DocumentFiscalPeriodFocus": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fiscal period values are FY, Q1, Q2, and Q3.  1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.",
        "label": "Document Fiscal Period Focus",
        "terseLabel": "Document Fiscal Period Focus"
       }
      }
     },
     "localname": "DocumentFiscalPeriodFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "fiscalPeriodItemType"
    },
    "dei_DocumentFiscalYearFocus": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This is focus fiscal year of the document report in YYYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.",
        "label": "Document Fiscal Year Focus",
        "terseLabel": "Document Fiscal Year Focus"
       }
      }
     },
     "localname": "DocumentFiscalYearFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "gYearItemType"
    },
    "dei_DocumentInformationLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Document Information [Line Items]",
        "terseLabel": "Document Information"
       }
      }
     },
     "localname": "DocumentInformationLineItems",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_DocumentInformationTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Container to support the formal attachment of each official or unofficial, public or private document as part of a submission package.",
        "label": "Document Information [Table]",
        "terseLabel": "Document Information"
       }
      }
     },
     "localname": "DocumentInformationTable",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_DocumentPeriodEndDate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is YYYY-MM-DD.",
        "label": "Document Period End Date",
        "terseLabel": "Document Period End Date"
       }
      }
     },
     "localname": "DocumentPeriodEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "dateItemType"
    },
    "dei_DocumentQuarterlyReport": {
     "auth_ref": [
      "r494"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as an quarterly report.",
        "label": "Document Quarterly Report",
        "terseLabel": "Document Quarterly Report"
       }
      }
     },
     "localname": "DocumentQuarterlyReport",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentTransitionReport": {
     "auth_ref": [
      "r495"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as a transition report.",
        "label": "Document Transition Report",
        "terseLabel": "Document Transition Report"
       }
      }
     },
     "localname": "DocumentTransitionReport",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentType": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.",
        "label": "Document Type",
        "terseLabel": "Document Type"
       }
      }
     },
     "localname": "DocumentType",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "submissionTypeItemType"
    },
    "dei_EntitiesTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Container to assemble all relevant information about each entity associated with the document instance",
        "label": "Entities [Table]",
        "terseLabel": "Entities"
       }
      }
     },
     "localname": "EntitiesTable",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_EntityAddressAddressLine1": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Address Line 1 such as Attn, Building Name, Street Name",
        "label": "Entity Address, Address Line One",
        "terseLabel": "Entity Address, Address Line One"
       }
      }
     },
     "localname": "EntityAddressAddressLine1",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressAddressLine2": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Address Line 2 such as Street or Suite number",
        "label": "Entity Address, Address Line Two",
        "terseLabel": "Entity Address, Address Line Two"
       }
      }
     },
     "localname": "EntityAddressAddressLine2",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressCityOrTown": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the City or Town",
        "label": "Entity Address, City or Town",
        "terseLabel": "Entity Address, City or Town"
       }
      }
     },
     "localname": "EntityAddressCityOrTown",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressPostalZipCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Code for the postal or zip code",
        "label": "Entity Address, Postal Zip Code",
        "terseLabel": "Entity Address, Postal Zip Code"
       }
      }
     },
     "localname": "EntityAddressPostalZipCode",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressStateOrProvince": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the state or province.",
        "label": "Entity Address, State or Province",
        "terseLabel": "Entity Address, State or Province"
       }
      }
     },
     "localname": "EntityAddressStateOrProvince",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "stateOrProvinceItemType"
    },
    "dei_EntityCentralIndexKey": {
     "auth_ref": [
      "r496"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.",
        "label": "Entity Central Index Key",
        "terseLabel": "Entity Central Index Key"
       }
      }
     },
     "localname": "EntityCentralIndexKey",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "centralIndexKeyItemType"
    },
    "dei_EntityCommonStockSharesOutstanding": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.",
        "label": "Entity Common Stock, Shares Outstanding",
        "terseLabel": "Entity Common Stock, Shares Outstanding"
       }
      }
     },
     "localname": "EntityCommonStockSharesOutstanding",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "sharesItemType"
    },
    "dei_EntityCurrentReportingStatus": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.",
        "label": "Entity Current Reporting Status",
        "terseLabel": "Entity Current Reporting Status"
       }
      }
     },
     "localname": "EntityCurrentReportingStatus",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "All the names of the entities being reported upon in a document. Any legal structure used to conduct activities or to hold assets. Some examples of such structures are corporations, partnerships, limited liability companies, grantor trusts, and other trusts. This item does not include business and geographical segments which are included in the geographical or business segments domains.",
        "label": "Entity [Domain]",
        "terseLabel": "Entity"
       }
      }
     },
     "localname": "EntityDomain",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "dei_EntityEmergingGrowthCompany": {
     "auth_ref": [
      "r496"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate if registrant meets the emerging growth company criteria.",
        "label": "Entity Emerging Growth Company",
        "terseLabel": "Entity Emerging Growth Company"
       }
      }
     },
     "localname": "EntityEmergingGrowthCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityFileNumber": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.",
        "label": "Entity File Number",
        "terseLabel": "Entity File Number"
       }
      }
     },
     "localname": "EntityFileNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "fileNumberItemType"
    },
    "dei_EntityFilerCategory": {
     "auth_ref": [
      "r496"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.",
        "label": "Entity Filer Category",
        "terseLabel": "Entity Filer Category"
       }
      }
     },
     "localname": "EntityFilerCategory",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "filerCategoryItemType"
    },
    "dei_EntityIncorporationStateCountryCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Two-character EDGAR code representing the state or country of incorporation.",
        "label": "Entity Incorporation, State or Country Code",
        "terseLabel": "Entity Incorporation, State or Country Code"
       }
      }
     },
     "localname": "EntityIncorporationStateCountryCode",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "edgarStateCountryItemType"
    },
    "dei_EntityInformationLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Entity Information [Line Items]",
        "terseLabel": "Entity Information"
       }
      }
     },
     "localname": "EntityInformationLineItems",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_EntityInteractiveDataCurrent": {
     "auth_ref": [
      "r497"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).",
        "label": "Entity Interactive Data Current",
        "terseLabel": "Entity Interactive Data Current"
       }
      }
     },
     "localname": "EntityInteractiveDataCurrent",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityListingParValuePerShare": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The par value per share of security quoted in same currency as Trading currency. Example: '0.01'.",
        "label": "Entity Listing, Par Value Per Share",
        "terseLabel": "Entity Listing, Par Value Per Share"
       }
      }
     },
     "localname": "EntityListingParValuePerShare",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "perShareItemType"
    },
    "dei_EntityRegistrantName": {
     "auth_ref": [
      "r496"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.",
        "label": "Entity Registrant Name",
        "terseLabel": "Entity Registrant Name"
       }
      }
     },
     "localname": "EntityRegistrantName",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityShellCompany": {
     "auth_ref": [
      "r496"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.",
        "label": "Entity Shell Company",
        "terseLabel": "Entity Shell Company"
       }
      }
     },
     "localname": "EntityShellCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntitySmallBusiness": {
     "auth_ref": [
      "r496"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicates that the company is a Smaller Reporting Company (SRC).",
        "label": "Entity Small Business",
        "terseLabel": "Entity Small Business"
       }
      }
     },
     "localname": "EntitySmallBusiness",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityTaxIdentificationNumber": {
     "auth_ref": [
      "r496"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.",
        "label": "Entity Tax Identification Number",
        "terseLabel": "Entity Tax Identification Number"
       }
      }
     },
     "localname": "EntityTaxIdentificationNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "employerIdItemType"
    },
    "dei_LegalEntityAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The set of legal entities associated with a report.",
        "label": "Legal Entity [Axis]",
        "terseLabel": "Legal Entity"
       }
      }
     },
     "localname": "LegalEntityAxis",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_LocalPhoneNumber": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Local phone number for entity.",
        "label": "Local Phone Number",
        "terseLabel": "Local Phone Number"
       }
      }
     },
     "localname": "LocalPhoneNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_Security12bTitle": {
     "auth_ref": [
      "r492"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Title of a 12(b) registered security.",
        "label": "Title of 12(b) Security",
        "terseLabel": "Title of 12(b) Security"
       }
      }
     },
     "localname": "Security12bTitle",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "securityTitleItemType"
    },
    "dei_SecurityExchangeName": {
     "auth_ref": [
      "r493"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the Exchange on which a security is registered.",
        "label": "Security Exchange Name",
        "terseLabel": "Security Exchange Name"
       }
      }
     },
     "localname": "SecurityExchangeName",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "edgarExchangeCodeItemType"
    },
    "dei_TradingSymbol": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Trading symbol of an instrument as listed on an exchange.",
        "label": "Trading Symbol",
        "terseLabel": "Trading Symbol"
       }
      }
     },
     "localname": "TradingSymbol",
     "nsuri": "http://xbrl.sec.gov/dei/2020-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "tradingSymbolItemType"
    },
    "nghc_A2019CreditAgreementMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "New Credit Agreement [Member]",
        "label": "2019 Credit Agreement [Member]",
        "terseLabel": "2019 Credit Agreement"
       }
      }
     },
     "localname": "A2019CreditAgreementMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_A4455LBJFreewayLLCMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "4455 LBJ Freeway, LLC",
        "label": "4455 LBJ Freeway, LLC [Member]",
        "terseLabel": "4455 LBJ Freeway, LLC"
       }
      }
     },
     "localname": "A4455LBJFreewayLLCMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_ACPReLtd.Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "ACP Re Ltd. [Member]",
        "label": "ACP Re Ltd. [Member]",
        "terseLabel": "ACP Re"
       }
      }
     },
     "localname": "ACPReLtd.Member",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_AlternateBaseRateOrLIBORMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Alternate Base Rate Or LIBOR [Member]",
        "label": "Alternate Base Rate Or LIBOR [Member]",
        "terseLabel": "Alternate Base Rate Or LIBOR"
       }
      }
     },
     "localname": "AlternateBaseRateOrLIBORMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_AmTrustFinancialServicesInc.Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "AmTrust Financial Services, Inc.",
        "label": "AmTrust Financial Services, Inc. [Member]",
        "terseLabel": "AmTrust Financial Services, Inc."
       }
      }
     },
     "localname": "AmTrustFinancialServicesInc.Member",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_AvailableforsaleDebtSecuritiesAmortizedCostBasisIncludingSecuritiesPledged": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Available-for-sale Debt Securities, Amortized Cost Basis, Including Securities Pledged",
        "label": "Available-for-sale Debt Securities, Amortized Cost Basis, Including Securities Pledged",
        "totalLabel": "Debt Securities"
       }
      }
     },
     "localname": "AvailableforsaleDebtSecuritiesAmortizedCostBasisIncludingSecuritiesPledged",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "nghc_AvailableforsaleSecuritiesDebtSecuritiesIncludingSecuritiesPledged": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Available-for-sale Securities, Debt Securities, Including Securities Pledged",
        "label": "Available-for-sale Securities, Debt Securities, Including Securities Pledged",
        "totalLabel": "Debt Securities"
       }
      }
     },
     "localname": "AvailableforsaleSecuritiesDebtSecuritiesIncludingSecuritiesPledged",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "nghc_CashAndShorttermInvestmentsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Cash And Short-term Investments [Member]",
        "label": "Cash And Short-term Investments [Member]",
        "terseLabel": "Cash and short-term investments"
       }
      }
     },
     "localname": "CashAndShorttermInvestmentsMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_CasualtyProgramMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Casualty Program [Member]",
        "label": "Casualty Program [Member]",
        "terseLabel": "Casualty Program"
       }
      }
     },
     "localname": "CasualtyProgramMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_CedingCommissionIncomeLoss": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 2.0,
       "parentTag": "us-gaap_Revenues",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails": {
       "order": 2.0,
       "parentTag": "nghc_CedingCommissionandServiceandFeeIncome",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 2.0,
       "parentTag": "nghc_UnderwritingRevenue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Ceding Commission Income (loss)",
        "label": "Ceding Commission Income (Loss)",
        "terseLabel": "Ceding commission income"
       }
      }
     },
     "localname": "CedingCommissionIncomeLoss",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "nghc_CedingCommissionandServiceandFeeIncome": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Ceding Commission and Service and Fee Income",
        "label": "Ceding Commission and Service and Fee Income",
        "totalLabel": "Fee Income"
       }
      }
     },
     "localname": "CedingCommissionandServiceandFeeIncome",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "nghc_CommercialAutoMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Commercial Auto",
        "label": "Commercial Auto [Member]",
        "terseLabel": "Small Business Auto"
       }
      }
     },
     "localname": "CommercialAutoMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_CommissionrevenueMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Commission revenue [Member]",
        "label": "Commission revenue [Member]",
        "terseLabel": "Commission revenue"
       }
      }
     },
     "localname": "CommissionrevenueMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_CreditAgreementMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Credit Agreement [Member]",
        "label": "Credit Agreement [Member]",
        "terseLabel": "Credit Agreement"
       }
      }
     },
     "localname": "CreditAgreementMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_CumulativeEffectPeriodOfAdoptionAdjustmentMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Cumulative Effect, Period Of Adoption, Adjustment",
        "label": "Cumulative Effect, Period Of Adoption, Adjustment [Member]",
        "terseLabel": "Cumulative Effect, Period of Adoption, Adjustment"
       }
      }
     },
     "localname": "CumulativeEffectPeriodOfAdoptionAdjustmentMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesPremiumsandOtherreceivablesChangesInAllowanceforExpectedCreditLossesDetails",
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesReinsuranceRecoverableChangesInAllowanceforExpectedCreditLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_CumulativeEffectPeriodOfAdoptionAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Cumulative Effect, Period Of Adoption",
        "label": "Cumulative Effect, Period Of Adoption [Axis]",
        "terseLabel": "Cumulative Effect, Period Of Adoption"
       }
      }
     },
     "localname": "CumulativeEffectPeriodOfAdoptionAxis",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesPremiumsandOtherreceivablesChangesInAllowanceforExpectedCreditLossesDetails",
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesReinsuranceRecoverableChangesInAllowanceforExpectedCreditLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "nghc_CumulativeEffectPeriodOfAdoptionDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Cumulative Effect, Period Of Adoption",
        "label": "Cumulative Effect, Period Of Adoption [Domain]",
        "terseLabel": "Cumulative Effect, Period Of Adoption"
       }
      }
     },
     "localname": "CumulativeEffectPeriodOfAdoptionDomain",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesPremiumsandOtherreceivablesChangesInAllowanceforExpectedCreditLossesDetails",
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesReinsuranceRecoverableChangesInAllowanceforExpectedCreditLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_DebtInstrumentCovenantEventsofDefaultMinimumChangeofControlPercent": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt Instrument, Covenant, Events of Default, Minimum Change of Control, Percent",
        "label": "Debt Instrument, Covenant, Events of Default, Minimum Change of Control, Percent",
        "terseLabel": "Minimum percent of change in control included as events of default"
       }
      }
     },
     "localname": "DebtInstrumentCovenantEventsofDefaultMinimumChangeofControlPercent",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_DebtInstrumentCovenantMinimumLoantoValuePercent": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt Instrument, Covenant, Minimum Loan to Value Percent",
        "label": "Debt Instrument, Covenant, Minimum Loan to Value Percent",
        "terseLabel": "Maintenance Covenant, minimum collateral interest as percent of value of outstanding loan balance"
       }
      }
     },
     "localname": "DebtInstrumentCovenantMinimumLoantoValuePercent",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_DebtInstrumentCovenantPercentOfOutstandingPrincipalBalanceDueAndPayableAnnually": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt Instrument, Covenant, Percent Of Outstanding Principal Balance Due And Payable Annually",
        "label": "Debt Instrument, Covenant, Percent Of Outstanding Principal Balance Due And Payable Annually",
        "terseLabel": "Percent of outstanding principal balance due and payable annually commencing on September 20, 2026"
       }
      }
     },
     "localname": "DebtInstrumentCovenantPercentOfOutstandingPrincipalBalanceDueAndPayableAnnually",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_DebtInstrumentInterestRateMaximumPaidinKindPercentage": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt Instrument, Interest Rate, Maximum Paid-in-Kind Percentage",
        "label": "Debt Instrument, Interest Rate, Maximum Paid-in-Kind Percentage",
        "terseLabel": "Maximum percent of interest that may be paid in kind"
       }
      }
     },
     "localname": "DebtInstrumentInterestRateMaximumPaidinKindPercentage",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_DebtSecuritiesExcludingUSTreasurySecuritiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt Securities, Excluding US Treasury Securities [Member]",
        "label": "Debt Securities, Excluding US Treasury Securities [Member]",
        "terseLabel": "Debt Securities, Excluding US Treasury Securities"
       }
      }
     },
     "localname": "DebtSecuritiesExcludingUSTreasurySecuritiesMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_DeferredAcquisitionCostsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Deferred Acquisition Costs [Abstract]",
        "label": "Deferred Acquisition Costs [Abstract]",
        "terseLabel": "Deferred Acquisition Costs [Abstract]"
       }
      }
     },
     "localname": "DeferredAcquisitionCostsAbstract",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "xbrltype": "stringItemType"
    },
    "nghc_DeferredPolicyAcquisitionCostsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Line Items] for Deferred Policy Acquisition Costs [Table]",
        "label": "Deferred Policy Acquisition Costs [Line Items]",
        "terseLabel": "Deferred Policy Acquisition Costs"
       }
      }
     },
     "localname": "DeferredPolicyAcquisitionCostsLineItems",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "nghc_DeferredPolicyAcquisitionCostsTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Deferred Policy Acquisition Costs [Table]",
        "label": "Deferred Policy Acquisition Costs [Table]",
        "terseLabel": "Deferred Policy Acquisition Costs"
       }
      }
     },
     "localname": "DeferredPolicyAcquisitionCostsTable",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "nghc_EightHundredSuperiorLLCMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Eight Hundred Superior, LLC [Member]",
        "label": "Eight Hundred Superior, LLC [Member]",
        "terseLabel": "800 Superior, LLC"
       }
      }
     },
     "localname": "EightHundredSuperiorLLCMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation",
        "label": "Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Table Text Block]",
        "terseLabel": "Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "nghc_FairValueAssetsMeasuredonRecurringBasisChangeinUnrealizedGainLossIncludedinOtherComprehensiveIncomeLoss": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Comprehensive Income (Loss)",
        "label": "Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Comprehensive Income (Loss)",
        "terseLabel": "Change in unrealized gains (losses) for the period included in other comprehensive income for assets held at the end of the reporting period"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredonRecurringBasisChangeinUnrealizedGainLossIncludedinOtherComprehensiveIncomeLoss",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "nghc_FairValueMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair Value [Member]",
        "label": "Fair Value [Member]",
        "terseLabel": "Investments, at fair value"
       }
      }
     },
     "localname": "FairValueMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_FinanceandProcessingFeesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Finance and Processing Fees [Member]",
        "label": "Finance and Processing Fees [Member]",
        "terseLabel": "Finance and processing fees"
       }
      }
     },
     "localname": "FinanceandProcessingFeesMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_FinancialInstitutionsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Financial Institutions [Member]",
        "label": "Financial Institutions [Member]",
        "terseLabel": "Financial Institutions"
       }
      }
     },
     "localname": "FinancialInstitutionsMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_FirstEventMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "First Event [Member]",
        "label": "First Event [Member]",
        "terseLabel": "First Event"
       }
      }
     },
     "localname": "FirstEventMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_GrouphealthadministrativefeesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Group health administrative fees [Member]",
        "label": "Group health administrative fees [Member]",
        "terseLabel": "Group health administrative fees"
       }
      }
     },
     "localname": "GrouphealthadministrativefeesMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_HomeownersMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Homeowners",
        "label": "Homeowners [Member]",
        "terseLabel": "Homeowners"
       }
      }
     },
     "localname": "HomeownersMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_IllinoisCenterBuildingL.P.Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Illinois Center Building, L.P.",
        "label": "Illinois Center Building, L.P. [Member]",
        "terseLabel": "Illinois Center Building, L.P."
       }
      }
     },
     "localname": "IllinoisCenterBuildingL.P.Member",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_IndentureEventsOfDefaultAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indenture Events Of Default [Axis]",
        "label": "Indenture Events Of Default [Axis]",
        "terseLabel": "Indenture Events Of Default"
       }
      }
     },
     "localname": "IndentureEventsOfDefaultAxis",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "nghc_IndentureEventsOfDefaultDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "[Domain] for Indenture Events Of Default [Axis]",
        "label": "Indenture Events Of Default [Domain]",
        "terseLabel": "Indenture Events Of Default"
       }
      }
     },
     "localname": "IndentureEventsOfDefaultDomain",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_IndentureExcessLeverageRatioMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indenture Excess Leverage Ratio [Member]",
        "label": "Indenture Excess Leverage Ratio [Member]",
        "terseLabel": "Indenture Excess Leverage Ratio"
       }
      }
     },
     "localname": "IndentureExcessLeverageRatioMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_IndustrialsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Industrials [Member]",
        "label": "Industrials [Member]",
        "terseLabel": "Industrials"
       }
      }
     },
     "localname": "IndustrialsMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_InstallmentfeesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Installment fees [Member]",
        "label": "Installment fees [Member]",
        "terseLabel": "Installment fees"
       }
      }
     },
     "localname": "InstallmentfeesMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_InsurancePoliciesAcquisitionCostsAndOtherUnderwritingExpenses": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 2.0,
       "parentTag": "us-gaap_BenefitsLossesAndExpenses",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_OperatingExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Insurance Policies, Acquisition Costs And Other Underwriting Expenses",
        "label": "Insurance Policies, Acquisition Costs And Other Underwriting Expenses",
        "terseLabel": "Acquisition costs and other underwriting expenses"
       }
      }
     },
     "localname": "InsurancePoliciesAcquisitionCostsAndOtherUnderwritingExpenses",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "nghc_InternationalMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "International [Member]",
        "label": "International [Member]",
        "terseLabel": "International"
       }
      }
     },
     "localname": "InternationalMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_InvestmentsByConsolidatedAndNonconsolidatedEntitiesAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investments by Consolidated and Nonconsolidated Entities",
        "label": "Investments by Consolidated and Nonconsolidated Entities [Axis]",
        "terseLabel": "Investments by Consolidated and Nonconsolidated Entities"
       }
      }
     },
     "localname": "InvestmentsByConsolidatedAndNonconsolidatedEntitiesAxis",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails",
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "nghc_InvestmentsByConsolidatedAndNonconsolidatedEntitiesDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investments by Consolidated and Nonconsolidated Entities",
        "label": "Investments by Consolidated and Nonconsolidated Entities [Domain]",
        "terseLabel": "Investments by Consolidated and Nonconsolidated Entities"
       }
      }
     },
     "localname": "InvestmentsByConsolidatedAndNonconsolidatedEntitiesDomain",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails",
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_InvestmentsCreditQualityIndicatorsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investments Credit Quality Indicators",
        "label": "Investments Credit Quality Indicators [Table Text Block]",
        "terseLabel": "Credit Quality of Investments"
       }
      }
     },
     "localname": "InvestmentsCreditQualityIndicatorsTableTextBlock",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "nghc_InvestmentsCreditQualityPercentageOfPortfolio": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investments, Credit Quality, Percentage Of Portfolio",
        "label": "Investments, Credit Quality, Percentage Of Portfolio",
        "terseLabel": "Investment quality - corporate bond holdings and industry concentrations"
       }
      }
     },
     "localname": "InvestmentsCreditQualityPercentageOfPortfolio",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_JPMorganChaseN.A.Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "JPMorgan Chase, N.A. [Member]",
        "label": "JPMorgan Chase, N.A. [Member]",
        "terseLabel": "JPMorgan Chase, N.A."
       }
      }
     },
     "localname": "JPMorganChaseN.A.Member",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_LSCEntitiesinvestmentinLPMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "LSC Entities investment in LP",
        "label": "LSC Entities investment in LP [Member]",
        "terseLabel": "LSC Entities investment in LP"
       }
      }
     },
     "localname": "LSCEntitiesinvestmentinLPMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_LSCEntitiyMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "LSC Entitiy",
        "label": "LSC Entitiy [Member]",
        "terseLabel": "LSC Entities"
       }
      }
     },
     "localname": "LSCEntitiyMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_LatepaymentfeesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Late payment fees [Member]",
        "label": "Late payment fees [Member]",
        "terseLabel": "Late payment fees"
       }
      }
     },
     "localname": "LatepaymentfeesMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_LeaseAgreement30NorthLaSalleMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Lease Agreement 30 North LaSalle",
        "label": "Lease Agreement 30 North LaSalle [Member]",
        "terseLabel": "Lease Agreement 30 North LaSalle"
       }
      }
     },
     "localname": "LeaseAgreement30NorthLaSalleMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsOtherRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_LeaseAgreement59MaidenLaneMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Lease Agreement 59 Maiden Lane",
        "label": "Lease Agreement 59 Maiden Lane [Member]",
        "terseLabel": "Lease Agreement 59 Maiden Lane"
       }
      }
     },
     "localname": "LeaseAgreement59MaidenLaneMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsOtherRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_LenderplacedinsuranceMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Lender-placed insurance business (\u201cLPI Business\u201d)",
        "label": "Lender-placed insurance [Member]",
        "verboseLabel": "Lender-placed insurance"
       }
      }
     },
     "localname": "LenderplacedinsuranceMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_LetterOfCreditFrontingFee": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Letter Of Credit Fronting Fee",
        "label": "Letter Of Credit Fronting Fee",
        "terseLabel": "Letter Of Credit Fronting Fee"
       }
      }
     },
     "localname": "LetterOfCreditFrontingFee",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_LimitedPartnershipPercentageParticipation": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Limited Partnership, Percentage Participation",
        "label": "Limited Partnership, Percentage Participation",
        "terseLabel": "Limited Partnership, Percentage Participation"
       }
      }
     },
     "localname": "LimitedPartnershipPercentageParticipation",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_LimitedPartnershipPercentageofProfitInterest": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Limited Partnership, Percentage of Profit Interest",
        "label": "Limited Partnership, Percentage of Profit Interest",
        "terseLabel": "Limited Partnership, Percentage of Profit Interest"
       }
      }
     },
     "localname": "LimitedPartnershipPercentageofProfitInterest",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_LineofCreditFacilityLeverageRatio": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line of Credit Facility, Leverage Ratio",
        "label": "Line of Credit Facility, Leverage Ratio",
        "terseLabel": "Line of Credit Facility, Leverage Ratio"
       }
      }
     },
     "localname": "LineofCreditFacilityLeverageRatio",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_MortgagebackedSecuritiesAvailableforsaleAmortizedCostBasis": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails": {
       "order": 5.0,
       "parentTag": "nghc_AvailableforsaleDebtSecuritiesAmortizedCostBasisIncludingSecuritiesPledged",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Mortgage-backed Securities Available-for-sale, Amortized Cost Basis",
        "label": "Mortgage-backed Securities Available-for-sale, Amortized Cost Basis",
        "terseLabel": "Mortgage-backed securities"
       }
      }
     },
     "localname": "MortgagebackedSecuritiesAvailableforsaleAmortizedCostBasis",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "nghc_NAAdvisorsGPLLCMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "NA Advisors GP LLC [Member]",
        "label": "NA Advisors GP LLC [Member]",
        "terseLabel": "NA Advisors GP LLC"
       }
      }
     },
     "localname": "NAAdvisorsGPLLCMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "National General Holdings Corp. (NGHC), Excluding Reciprocals",
        "label": "National General Holdings Corp. (NGHC), Excluding Reciprocals [Member]",
        "terseLabel": "NGHC, excluding Reciprocal Exchanges"
       }
      }
     },
     "localname": "NationalGeneralHoldingsCorp.NGHCExcludingReciprocalsMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_NorthDearbornBuildingCompanyL.P.Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "North Dearborn Building Company, L.P. [Member]",
        "label": "North Dearborn Building Company, L.P. [Member]",
        "terseLabel": "North Dearborn Building Company, L.P."
       }
      }
     },
     "localname": "NorthDearbornBuildingCompanyL.P.Member",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_NotesPayableSevenPointSixTwoFivePercentMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Notes Payable Seven Point Six Two Five Percent",
        "label": "Notes Payable Seven Point Six Two Five Percent [Member]",
        "terseLabel": "7.625% Notes"
       }
      }
     },
     "localname": "NotesPayableSevenPointSixTwoFivePercentMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
      "http://www.nationalgeneral.com/role/DebtSeniorNotesDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_NotesPayableSixPointSevenFivePercentMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Notes Payable Six Point Seven Five Percent",
        "label": "Notes Payable Six Point Seven Five Percent [Member]",
        "terseLabel": "6.75% Notes"
       }
      }
     },
     "localname": "NotesPayableSixPointSevenFivePercentMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
      "http://www.nationalgeneral.com/role/DebtSeniorNotesDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_NumberOfReinstatements": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number Of Reinstatements",
        "label": "Number Of Reinstatements",
        "terseLabel": "Number of reinstatements"
       }
      }
     },
     "localname": "NumberOfReinstatements",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "nghc_OtherInvestmentsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Investments",
        "label": "Other Investments [Table Text Block]",
        "terseLabel": "Other Investments"
       }
      }
     },
     "localname": "OtherInvestmentsTableTextBlock",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "nghc_OtherMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other [Member]",
        "label": "Other [Member]",
        "terseLabel": "Other, net",
        "verboseLabel": "Other"
       }
      }
     },
     "localname": "OtherMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_OtherNetRealizedGainLossonInvestments": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other Net Realized Gain (Loss) on Investments",
        "label": "Other Net Realized Gain (Loss) on Investments",
        "terseLabel": "Other Net Realized Gain (Loss) on Investments"
       }
      }
     },
     "localname": "OtherNetRealizedGainLossonInvestments",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "nghc_OtherserviceandfeeincomeMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other service and fee income [Member]",
        "label": "Other service and fee income [Member]",
        "terseLabel": "Other service and fee income"
       }
      }
     },
     "localname": "OtherserviceandfeeincomeMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_PercentageOfCorporateBondsPortfolio": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage Of Corporate Bonds Portfolio",
        "label": "Percentage Of Corporate Bonds Portfolio",
        "terseLabel": "% of Corporate Bonds Portfolio"
       }
      }
     },
     "localname": "PercentageOfCorporateBondsPortfolio",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_PercentageofDebtSecurities": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of Debt Securities",
        "label": "Percentage of Debt Securities",
        "terseLabel": "Percentage"
       }
      }
     },
     "localname": "PercentageofDebtSecurities",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_PersonalAutoMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Personal Auto",
        "label": "Personal Auto [Member]",
        "terseLabel": "Personal Auto"
       }
      }
     },
     "localname": "PersonalAutoMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_PersonalLinesAutoMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Personal Lines, Auto",
        "label": "Personal Lines, Auto [Member]",
        "terseLabel": "Personal lines, auto"
       }
      }
     },
     "localname": "PersonalLinesAutoMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_PersonalLinesHomeownersMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Personal Lines, Homeowners",
        "label": "Personal Lines, Homeowners [Member]",
        "terseLabel": "Personal lines, homeowners"
       }
      }
     },
     "localname": "PersonalLinesHomeownersMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_PersonalLinesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Personal Lines",
        "label": "Personal Lines [Member]",
        "terseLabel": "Personal lines"
       }
      }
     },
     "localname": "PersonalLinesMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_PreferredStockDepositarySharesIssued": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Preferred Stock, Depositary Shares Issued",
        "label": "Preferred Stock, Depositary Shares Issued",
        "terseLabel": "Depositary shares issued and outstanding"
       }
      }
     },
     "localname": "PreferredStockDepositarySharesIssued",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "nghc_PreferredStockDividendsPerDepositaryShareCashPaid": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Preferred Stock, Dividends, Per Depositary Share, Cash Paid",
        "label": "Preferred Stock, Dividends, Per Depositary Share, Cash Paid",
        "terseLabel": "Preferred Stock, Dividend Per Depositary Share"
       }
      }
     },
     "localname": "PreferredStockDividendsPerDepositaryShareCashPaid",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityCommonandPreferredStockDividendsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "nghc_PreferredStockSeriesBAndSeriesCMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Preferred Stock Series B And Series C [Member]",
        "label": "Preferred Stock Series B And Series C [Member]",
        "terseLabel": "Preferred Stock Series B And Series C"
       }
      }
     },
     "localname": "PreferredStockSeriesBAndSeriesCMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityCommonandPreferredStockDividendsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_PreferredStockTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Preferred Stock [Table Text Block]",
        "label": "Preferred Stock [Table Text Block]",
        "terseLabel": "Schedule of Preferred Stock"
       }
      }
     },
     "localname": "PreferredStockTableTextBlock",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "nghc_PremiumsEarnedGross": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Premiums Earned, Gross",
        "label": "Premiums Earned, Gross",
        "totalLabel": "Premiums Earned, Gross"
       }
      }
     },
     "localname": "PremiumsEarnedGross",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "nghc_PropertyCatastropheProgramMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Property Catastrophe Program [Member]",
        "label": "Property Catastrophe Program [Member]",
        "terseLabel": "Property Catastrophe Program"
       }
      }
     },
     "localname": "PropertyCatastropheProgramMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_PropertyandCasualtyOtherMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Property and Casualty Other Product",
        "label": "Property and Casualty Other [Member]",
        "terseLabel": "Other"
       }
      }
     },
     "localname": "PropertyandCasualtyOtherMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_QuotaShareAgreementTerm": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Quota Share Agreement, Term",
        "label": "Quota Share Agreement, Term",
        "terseLabel": "Quota share agreement, term"
       }
      }
     },
     "localname": "QuotaShareAgreementTerm",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "nghc_RSUsAdditionalDisclosuresAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "RSUs Additional Disclosures",
        "label": "RSUs Additional Disclosures [Abstract]",
        "terseLabel": "RSUs Additional Disclosures"
       }
      }
     },
     "localname": "RSUsAdditionalDisclosuresAbstract",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "nghc_RVPackagedMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "RV/Packaged",
        "label": "RV/Packaged [Member]",
        "terseLabel": "RV/Packaged"
       }
      }
     },
     "localname": "RVPackagedMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_ReclassificationadjustmentsforinvestmentsgainlosstonetincomeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reclassification adjustments for investment gain/loss to net income",
        "label": "Reclassification adjustments for investments gain/loss to net income [Abstract]",
        "terseLabel": "Reclassification adjustments for investments gain or loss to net income:"
       }
      }
     },
     "localname": "ReclassificationadjustmentsforinvestmentsgainlosstonetincomeAbstract",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "stringItemType"
    },
    "nghc_ReinsurancePercentageofBusinessCeded": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reinsurance - Percentage of Business Ceded under a Quota Share Agreement (Net Liability)",
        "label": "Reinsurance - Percentage of Business Ceded",
        "terseLabel": "Reinsurance - Percentage of Business Ceded"
       }
      }
     },
     "localname": "ReinsurancePercentageofBusinessCeded",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_ReinsurancePercentageofCedingCommission": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Reinsurance, Percentage of Ceding Commission",
        "label": "Reinsurance - Percentage of Ceding Commission",
        "terseLabel": "Reinsurance percentage of ceding commission"
       }
      }
     },
     "localname": "ReinsurancePercentageofCedingCommission",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_ScheduleOfSummaryOfPremiumsAndLossesCededTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule Of Summary Of Premiums And Losses Ceded [Table Text Block]",
        "label": "Schedule Of Summary Of Premiums And Losses Ceded [Table Text Block]",
        "terseLabel": "Schedule of Effect of Reinsurance on Premiums"
       }
      }
     },
     "localname": "ScheduleOfSummaryOfPremiumsAndLossesCededTableTextBlock",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "nghc_ScheduleofReinsuranceRecoverableTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of Reinsurance Recoverable",
        "label": "Schedule of Reinsurance Recoverable [Table Text Block]",
        "terseLabel": "Schedule of Reinsurance Recoverable"
       }
      }
     },
     "localname": "ScheduleofReinsuranceRecoverableTableTextBlock",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "nghc_SecondEventMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Second Event [Member]",
        "label": "Second Event [Member]",
        "terseLabel": "Second Event"
       }
      }
     },
     "localname": "SecondEventMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_StandardPoorsAAAAMinusandAAPlusRatingMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Standard &amp; Poor's, AA, AA-, and AA+ Rating [Member]",
        "label": "Standard &amp; Poor's, AA, AA Minus, and AA Plus Rating [Member]",
        "terseLabel": "Standard &amp; Poor's, AA, AA Plus, and AA Minus Rating"
       }
      }
     },
     "localname": "StandardPoorsAAAAMinusandAAPlusRatingMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_StandardPoorsAAPlusandAMinusRatingMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Standard &amp; Poor's, A, A+, and A- Rating [Member]",
        "label": "Standard &amp; Poor's, A, A Plus, and A Minus Rating [Member]",
        "terseLabel": "Standard &amp; Poor's, A, A Plus, and A Minus Rating"
       }
      }
     },
     "localname": "StandardPoorsAAPlusandAMinusRatingMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_StandardPoorsBBBBBBPlusBBBMinusRatingMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Standard &amp; Poor's, BBB, BBB Plus, BBB Minus Rating [Member]",
        "label": "Standard &amp; Poor's, BBB, BBB Plus, BBB Minus Rating [Member]",
        "terseLabel": "Standard &amp; Poor's, BBB, BBB Plus, and BBB Minus Rating"
       }
      }
     },
     "localname": "StandardPoorsBBBBBBPlusBBBMinusRatingMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_StandardPoorsBBPlusAndLowerRatingMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Standard &amp; Poor's, BB Plus And Lower Rating [Member]",
        "label": "Standard &amp; Poor's, BB Plus And Lower Rating [Member]",
        "terseLabel": "Standard &amp; Poor's, BB Plus and Lower Rating"
       }
      }
     },
     "localname": "StandardPoorsBBPlusAndLowerRatingMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_SubordinatedDebenturesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Subordinated Debentures",
        "label": "Subordinated Debentures [Member]",
        "terseLabel": "Subordinated Debentures"
       }
      }
     },
     "localname": "SubordinatedDebenturesMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_SubordinatedDebenturesTrancheIIMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Subordinated Debentures Tranche II due 2037",
        "label": "Subordinated Debentures Tranche II [Member]",
        "terseLabel": "Subordinated Debentures Tranche II"
       }
      }
     },
     "localname": "SubordinatedDebenturesTrancheIIMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_SubordinatedDebenturesTrancheIMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Subordinated Debentures Tranche I due 2035",
        "label": "Subordinated Debentures Tranche I [Member]",
        "terseLabel": "Subordinated Debentures Tranche I"
       }
      }
     },
     "localname": "SubordinatedDebenturesTrancheIMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_SurplusNotesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Surplus Notes [Member]",
        "label": "Surplus Notes [Member]",
        "terseLabel": "Surplus Notes"
       }
      }
     },
     "localname": "SurplusNotesMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_ThirdPartyFeeMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Third Party Fee [Member]",
        "label": "Third Party Fee [Member]",
        "terseLabel": "Third-Party Fee"
       }
      }
     },
     "localname": "ThirdPartyFeeMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "nghc_TwentyFivePercentOfAmortizedCostorCost": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Twenty Five Percent Of Amortized Cost or Cost",
        "label": "Twenty Five Percent Of Amortized Cost or Cost",
        "terseLabel": "25% of amortized cost or cost"
       }
      }
     },
     "localname": "TwentyFivePercentOfAmortizedCostorCost",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "nghc_UnamortizedDebtIssuanceCostsandUnamortizedDiscountPremiumNet": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unamortized Debt Issuance Costs and Unamortized Discount (Premium), Net",
        "label": "Unamortized Debt Issuance Costs and Unamortized Discount (Premium), Net",
        "negatedTerseLabel": "Unamortized debt issuance costs and unamortized discount"
       }
      }
     },
     "localname": "UnamortizedDebtIssuanceCostsandUnamortizedDiscountPremiumNet",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "nghc_UnderwritingRevenue": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Underwriting Revenue",
        "label": "Underwriting Revenue",
        "totalLabel": "Total underwriting revenues"
       }
      }
     },
     "localname": "UnderwritingRevenue",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "nghc_UnearnedPremiumsAssumed": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unearned Premiums, Assumed",
        "label": "Unearned Premiums, Assumed",
        "terseLabel": "Unearned premiums, assumed"
       }
      }
     },
     "localname": "UnearnedPremiumsAssumed",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "nghc_UtilitiesAndOtherMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Utilities And Other [Member]",
        "label": "Utilities And Other [Member]",
        "terseLabel": "Utilities And Other"
       }
      }
     },
     "localname": "UtilitiesAndOtherMember",
     "nsuri": "http://www.nationalgeneral.com/20200930",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_AffiliatedEntityMember": {
     "auth_ref": [
      "r252",
      "r339",
      "r340",
      "r491"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Affiliated Entity [Member]",
        "terseLabel": "Related Parties"
       }
      }
     },
     "localname": "AffiliatedEntityMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails",
      "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsOtherRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_CounterpartyNameAxis": {
     "auth_ref": [
      "r33",
      "r93"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Counterparty Name [Axis]",
        "terseLabel": "Counterparty Name"
       }
      }
     },
     "localname": "CounterpartyNameAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_CreditRatingStandardPoorsAxis": {
     "auth_ref": [
      "r141",
      "r198",
      "r199",
      "r225",
      "r303"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Credit Rating, Standard &amp; Poor's [Axis]",
        "terseLabel": "Credit Rating, Standard &amp; Poor's"
       }
      }
     },
     "localname": "CreditRatingStandardPoorsAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_EquityMethodInvesteeNameDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Investment, Name [Domain]",
        "terseLabel": "Investment, Name"
       }
      }
     },
     "localname": "EquityMethodInvesteeNameDomain",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_ExternalCreditRatingStandardPoorsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "External Credit Rating, Standard &amp; Poor's [Domain]",
        "terseLabel": "External Credit Rating, Standard &amp; Poor's"
       }
      }
     },
     "localname": "ExternalCreditRatingStandardPoorsMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_MaximumMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Maximum [Member]",
        "terseLabel": "Maximum"
       }
      }
     },
     "localname": "MaximumMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_MinimumMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Minimum [Member]",
        "terseLabel": "Minimum"
       }
      }
     },
     "localname": "MinimumMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_ProductOrServiceAxis": {
     "auth_ref": [
      "r137",
      "r248",
      "r249",
      "r457",
      "r458"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Product and Service [Axis]",
        "terseLabel": "Products and Services"
       }
      }
     },
     "localname": "ProductOrServiceAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_ProductsAndServicesDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Product and Service [Domain]",
        "terseLabel": "Products and Services"
       }
      }
     },
     "localname": "ProductsAndServicesDomain",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_RangeAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statistical Measurement [Axis]",
        "terseLabel": "Range"
       }
      }
     },
     "localname": "RangeAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_RangeMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statistical Measurement [Domain]",
        "terseLabel": "Range"
       }
      }
     },
     "localname": "RangeMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_RepurchaseAgreementCounterpartyNameDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Counterparty Name [Domain]",
        "terseLabel": "Counterparty Name"
       }
      }
     },
     "localname": "RepurchaseAgreementCounterpartyNameDomain",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis": {
     "auth_ref": [
      "r175"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Investment, Name [Axis]",
        "terseLabel": "Investment, Name"
       }
      }
     },
     "localname": "ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_StandardPoorsAAARatingMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Standard &amp; Poor's, AAA Rating [Member]",
        "terseLabel": "Standard &amp; Poor's, AAA Rating"
       }
      }
     },
     "localname": "StandardPoorsAAARatingMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccidentAndHealthInsuranceSegmentMember": {
     "auth_ref": [
      "r440",
      "r460"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Product line consisting of insurance against loss by illness or injury, including but not limited to medical, dental, disability, workmen's compensation and long-term care.",
        "label": "Accident and Health Insurance Product Line [Member]",
        "terseLabel": "Accident and Health"
       }
      }
     },
     "localname": "AccidentAndHealthInsuranceSegmentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccountingPoliciesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Accounting Policies [Abstract]",
        "terseLabel": "Accounting Policies [Abstract]"
       }
      }
     },
     "localname": "AccountingPoliciesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccountingStandardsUpdate201613Member": {
     "auth_ref": [
      "r186"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accounting Standards Update 2016-13 Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.",
        "label": "Accounting Standards Update 2016-13 [Member]",
        "terseLabel": "Accounting Standards Update 2016-13"
       }
      }
     },
     "localname": "AccountingStandardsUpdate201613Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent": {
     "auth_ref": [
      "r377",
      "r421"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 4.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.",
        "label": "Accounts Payable and Accrued Liabilities",
        "terseLabel": "Accounts payable and accrued expenses (Exchanges - $7,604 and $8,497)",
        "verboseLabel": "Accounts payable and accrued expenses"
       }
      }
     },
     "localname": "AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccruedInvestmentIncomeReceivable": {
     "auth_ref": [
      "r15",
      "r365",
      "r414"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 4.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.",
        "label": "Accrued Investment Income Receivable",
        "terseLabel": "Accrued investment income (related parties - $1,210 and $2,391) (Exchanges - $1,397 and $2,001)",
        "verboseLabel": "Accrued investment income"
       }
      }
     },
     "localname": "AccruedInvestmentIncomeReceivable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax": {
     "auth_ref": [
      "r41"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 2.0,
       "parentTag": "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax",
        "terseLabel": "Unrealized gain on investments, net of tax"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax": {
     "auth_ref": [
      "r34",
      "r39",
      "r41",
      "r42",
      "r317",
      "r322",
      "r328"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 1.0,
       "parentTag": "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.",
        "label": "Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax",
        "terseLabel": "Unrealized foreign currency translation adjustment, net of tax"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax": {
     "auth_ref": [
      "r39",
      "r41",
      "r42"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 5.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.",
        "label": "Accumulated Other Comprehensive Income (Loss), Net of Tax",
        "totalLabel": "Total accumulated other comprehensive income"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]",
        "terseLabel": "Accumulated other comprehensive income:"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeMember": {
     "auth_ref": [
      "r38",
      "r42",
      "r45",
      "r297"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated increase (decrease) in equity from transactions and other events and circumstances from non-owner sources, attributable to the parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners.",
        "label": "AOCI Attributable to Parent [Member]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss)"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AdditionalPaidInCapital": {
     "auth_ref": [
      "r16"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 4.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.",
        "label": "Additional Paid in Capital",
        "terseLabel": "Additional paid-in capital"
       }
      }
     },
     "localname": "AdditionalPaidInCapital",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdditionalPaidInCapitalMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders.",
        "label": "Additional Paid-in Capital [Member]",
        "terseLabel": "Additional Paid-in Capital"
       }
      }
     },
     "localname": "AdditionalPaidInCapitalMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AdjustmentsForNewAccountingPronouncementsAxis": {
     "auth_ref": [
      "r101"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by new accounting pronouncement.",
        "label": "Adjustments for New Accounting Pronouncements [Axis]",
        "terseLabel": "Adjustments for New Accounting Pronouncements"
       }
      }
     },
     "localname": "AdjustmentsForNewAccountingPronouncementsAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement.",
        "label": "Share-based Payment Arrangement, Decrease for Tax Withholding Obligation",
        "negatedTerseLabel": "Shares withheld related to net share settlement, value"
       }
      }
     },
     "localname": "AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue": {
     "auth_ref": [
      "r254",
      "r256",
      "r280",
      "r281"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.",
        "label": "APIC, Share-based Payment Arrangement, Increase for Cost Recognition",
        "terseLabel": "Stock-based compensation"
       }
      }
     },
     "localname": "AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]",
        "terseLabel": "Adjustments to reconcile net income to cash provided by (used in) operating activities:"
       }
      }
     },
     "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AllocatedShareBasedCompensationExpense": {
     "auth_ref": [
      "r256",
      "r275",
      "r279"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.",
        "label": "Share-based Payment Arrangement, Expense",
        "terseLabel": "Stock-compensation expense"
       }
      }
     },
     "localname": "AllocatedShareBasedCompensationExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AllowanceForCreditLossesTextBlock": {
     "auth_ref": [
      "r145"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for allowance for credit losses.",
        "label": "Allowance for Credit Losses [Text Block]",
        "terseLabel": "Allowance for Expected Credit Losses"
       }
      }
     },
     "localname": "AllowanceForCreditLossesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLosses"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_AssetBackedSecuritiesMember": {
     "auth_ref": [
      "r162",
      "r250"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Securities that are primarily serviced by the cash flows of a discrete pool of receivables or other financial assets for example, but not limited to, credit card receivables, car loans, recreational vehicle loans, and mobile home loans.",
        "label": "Asset-backed Securities [Member]",
        "terseLabel": "Asset-backed securities"
       }
      }
     },
     "localname": "AssetBackedSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember": {
     "auth_ref": [
      "r162",
      "r250"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Securities that are primarily serviced with cash flows derived financial assets that are being securitized for example, but not limited to, credit card receivables, car loans, recreational vehicle loans, and mobile home loans. Excludes mortgage-backed securities.",
        "label": "Asset-backed Securities, Securitized Loans and Receivables [Member]",
        "terseLabel": "Structured securities"
       }
      }
     },
     "localname": "AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_Assets": {
     "auth_ref": [
      "r131",
      "r366",
      "r406"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
        "label": "Assets",
        "totalLabel": "Total assets"
       }
      }
     },
     "localname": "Assets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Assets [Abstract]",
        "terseLabel": "ASSETS"
       }
      }
     },
     "localname": "AssetsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AssetsHeldByInsuranceRegulators": {
     "auth_ref": [
      "r478"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsCashandCashEquivalentsRestrictedCashandRestrictedInvestmentsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_RestrictedCashAndInvestments",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.",
        "label": "Assets Held by Insurance Regulators",
        "terseLabel": "Securities on deposit with state regulatory authorities"
       }
      }
     },
     "localname": "AssetsHeldByInsuranceRegulators",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsCashandCashEquivalentsRestrictedCashandRestrictedInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsHeldInTrust": {
     "auth_ref": [
      "r94"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsCashandCashEquivalentsRestrictedCashandRestrictedInvestmentsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_RestrictedCashAndInvestments",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.",
        "label": "Assets Held-in-trust",
        "terseLabel": "Restricted investments to trusts in certain reinsurance transactions"
       }
      }
     },
     "localname": "AssetsHeldInTrust",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsCashandCashEquivalentsRestrictedCashandRestrictedInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssumedLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense": {
     "auth_ref": [
      "r452",
      "r455"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Liability as of the balance sheet date for the estimated ultimate cost of settling claims and claim adjustment expense relating to insured events that have occurred on or before the balance sheet date for those liabilities owed to another party as a result of assuming another insurer's primary obligation.",
        "label": "Assumed Liability for Unpaid Claims and Claims Adjustment Expense",
        "terseLabel": "Unpaid Loss and LAE reserves, assumed"
       }
      }
     },
     "localname": "AssumedLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails",
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssumedPremiumsEarned": {
     "auth_ref": [
      "r425",
      "r438",
      "r468",
      "r471"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_PremiumsEarnedNet",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of earned premiums assumed from other entities.",
        "label": "Assumed Premiums Earned",
        "verboseLabel": "Assumed, Earned"
       }
      }
     },
     "localname": "AssumedPremiumsEarned",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssumedPremiumsWritten": {
     "auth_ref": [
      "r468"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_PremiumsWrittenNet",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of written premiums assumed from other entities.",
        "label": "Assumed Premiums Written",
        "terseLabel": "Assumed, Written"
       }
      }
     },
     "localname": "AssumedPremiumsWritten",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax": {
     "auth_ref": [
      "r153"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax",
        "terseLabel": "Debt Securities"
       }
      }
     },
     "localname": "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax": {
     "auth_ref": [
      "r154"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax",
        "negatedTerseLabel": "Debt Securities"
       }
      }
     },
     "localname": "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis": {
     "auth_ref": [
      "r150",
      "r200"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale, Amortized Cost",
        "terseLabel": "Debt Securities, Available-for-sale, Amortized Cost"
       }
      }
     },
     "localname": "AvailableForSaleDebtSecuritiesAmortizedCostBasis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecurities": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.",
        "label": "Available-for-sale Securities",
        "terseLabel": "Fair Value"
       }
      }
     },
     "localname": "AvailableForSaleSecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Debt Securities, Available-for-sale [Abstract]",
        "terseLabel": "Debt Securities, Available-for-sale [Abstract]"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax": {
     "auth_ref": [
      "r153"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.",
        "label": "Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax",
        "terseLabel": "Total"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.",
        "label": "Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax",
        "negatedTerseLabel": "Total"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesAmortizedCost": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.",
        "label": "Available-for-sale Securities, Amortized Cost Basis",
        "terseLabel": "Amortized Cost"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss",
        "negatedTerseLabel": "12 Months or More"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss": {
     "auth_ref": [
      "r166"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss",
        "negatedTotalLabel": "Total"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]",
        "terseLabel": "Gross Unrealized Losses"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss",
        "negatedTerseLabel": "Less Than 12 Months"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value",
        "terseLabel": "Less Than 12 Months"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.",
        "label": "Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value",
        "terseLabel": "12 Months or More"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost": {
     "auth_ref": [
      "r159"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails": {
       "order": 3.0,
       "parentTag": "nghc_AvailableforsaleDebtSecuritiesAmortizedCostBasisIncludingSecuritiesPledged",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost",
        "terseLabel": "Due after five years through ten years"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue": {
     "auth_ref": [
      "r155",
      "r159",
      "r389"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails": {
       "order": 3.0,
       "parentTag": "nghc_AvailableforsaleSecuritiesDebtSecuritiesIncludingSecuritiesPledged",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value",
        "terseLabel": "Due after five years through ten years"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost": {
     "auth_ref": [
      "r158"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails": {
       "order": 2.0,
       "parentTag": "nghc_AvailableforsaleDebtSecuritiesAmortizedCostBasisIncludingSecuritiesPledged",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost",
        "terseLabel": "Due after one year through five years"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue": {
     "auth_ref": [
      "r155",
      "r158",
      "r388"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails": {
       "order": 2.0,
       "parentTag": "nghc_AvailableforsaleSecuritiesDebtSecuritiesIncludingSecuritiesPledged",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value",
        "terseLabel": "Due after one year through five years"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost": {
     "auth_ref": [
      "r160"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails": {
       "order": 4.0,
       "parentTag": "nghc_AvailableforsaleDebtSecuritiesAmortizedCostBasisIncludingSecuritiesPledged",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost",
        "terseLabel": "Due after ten years"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue": {
     "auth_ref": [
      "r155",
      "r160",
      "r390"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails": {
       "order": 4.0,
       "parentTag": "nghc_AvailableforsaleSecuritiesDebtSecuritiesIncludingSecuritiesPledged",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investment in debt security, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value",
        "terseLabel": "Due after ten years"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]",
        "terseLabel": "Amortized Cost"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]",
        "terseLabel": "Fair Value"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost": {
     "auth_ref": [
      "r157"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails": {
       "order": 1.0,
       "parentTag": "nghc_AvailableforsaleDebtSecuritiesAmortizedCostBasisIncludingSecuritiesPledged",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amortized cost of investment in debt security measured at fair value with change recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost",
        "terseLabel": "Due in one year or less"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue": {
     "auth_ref": [
      "r155",
      "r157",
      "r387"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails": {
       "order": 1.0,
       "parentTag": "nghc_AvailableforsaleSecuritiesDebtSecuritiesIncludingSecuritiesPledged",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
        "label": "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value",
        "terseLabel": "Due in one year or less"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesDebtSecurities": {
     "auth_ref": [
      "r146",
      "r151",
      "r200"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 1.0,
       "parentTag": "us-gaap_Investments",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale",
        "terseLabel": "Debt securities, available-for-sale, at fair value (allowance for expected credit losses $1,085 - 2020) (Exchanges - $300,124 and $324,249; allowance for expected credit losses $150 - 2020)",
        "verboseLabel": "Debt securities, available-for-sale"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesDebtSecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.",
        "label": "Available-for-sale Securities, Gross Realized Gain (Loss)",
        "totalLabel": "Net realized gain on debt securities, available-for-sale"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesGrossRealizedGainLossNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesGrossRealizedGains": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.",
        "label": "Available-for-sale Securities, Gross Realized Gains",
        "terseLabel": "Debt securities, available-for-sale, gross gains"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesGrossRealizedGains",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.",
        "label": "Available-for-sale Securities, Gross Realized Losses",
        "negatedTerseLabel": "Debt securities, available-for-sale, gross losses"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesGrossRealizedLosses",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainLossAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]",
        "terseLabel": "Debt Securities, Available-for-sale, Unrealized Gain (Loss)"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesGrossUnrealizedGainLossAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AvailableForSaleSecuritiesTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.",
        "label": "Available-for-sale Securities [Table Text Block]",
        "terseLabel": "Available-for-Sale Debt Securities"
       }
      }
     },
     "localname": "AvailableForSaleSecuritiesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1": {
     "auth_ref": [
      "r164"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.",
        "label": "Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions",
        "terseLabel": "Number of securities with gross unrealized loss"
       }
      }
     },
     "localname": "AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "us-gaap_AwardTypeAxis": {
     "auth_ref": [
      "r257",
      "r277"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of award under share-based payment arrangement.",
        "label": "Award Type [Axis]",
        "terseLabel": "Award Type"
       }
      }
     },
     "localname": "AwardTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BasisOfAccountingPolicyPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).",
        "label": "Basis of Accounting, Policy [Policy Text Block]",
        "terseLabel": "Basis of Accounting, Policy"
       }
      }
     },
     "localname": "BasisOfAccountingPolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RecentAccountingPronouncementsPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_BenefitsLossesAndExpenses": {
     "auth_ref": [
      "r435"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs.",
        "label": "Benefits, Losses and Expenses",
        "totalLabel": "Total expenses"
       }
      }
     },
     "localname": "BenefitsLossesAndExpenses",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BenefitsLossesAndExpensesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Benefits, Losses and Expenses [Abstract]",
        "terseLabel": "Expenses:"
       }
      }
     },
     "localname": "BenefitsLossesAndExpensesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_CapitalLeaseObligationsMember": {
     "auth_ref": [
      "r334"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A borrowing recorded for a lease meeting the criteria for capitalization. A lease is defined as an agreement conveying the right to use property, plant, or equipment (land or depreciable assets) usually for a stated period of time.",
        "label": "Capital Lease Obligations [Member]",
        "terseLabel": "Finance lease liabilities"
       }
      }
     },
     "localname": "CapitalLeaseObligationsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CashAndCashEquivalentsAtCarryingValue": {
     "auth_ref": [
      "r2",
      "r21",
      "r86"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 2.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/InvestmentsCashandCashEquivalentsRestrictedCashandRestrictedInvestmentsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.",
        "label": "Cash and Cash Equivalents, at Carrying Value",
        "terseLabel": "Cash and cash equivalents (Exchanges - $416 and $959)",
        "verboseLabel": "Cash and cash equivalents"
       }
      }
     },
     "localname": "CashAndCashEquivalentsAtCarryingValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/InvestmentsCashandCashEquivalentsRestrictedCashandRestrictedInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents": {
     "auth_ref": [
      "r80",
      "r86",
      "r88"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsCashandCashEquivalentsRestrictedCashandRestrictedInvestmentsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents",
        "periodEndLabel": "Cash, cash equivalents, and restricted cash at end of the period",
        "periodStartLabel": "Cash, cash equivalents, and restricted cash at beginning of the period",
        "totalLabel": "Total cash, cash equivalents and restricted cash"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows",
      "http://www.nationalgeneral.com/role/InvestmentsCashandCashEquivalentsRestrictedCashandRestrictedInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect": {
     "auth_ref": [
      "r80",
      "r321"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect",
        "totalLabel": "Net increase (decrease) in cash, cash equivalents, and restricted cash"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]",
        "terseLabel": "Supplemental disclosures of non-cash financing activities:"
       }
      }
     },
     "localname": "CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_CatastrophicEventDomain": {
     "auth_ref": [
      "r222",
      "r223"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Catastrophic event, for example, but not limited to, earthquake, windstorm, fire or explosion.",
        "label": "Catastrophic Event [Domain]",
        "terseLabel": "Catastrophic Event"
       }
      }
     },
     "localname": "CatastrophicEventDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CededPremiumsEarned": {
     "auth_ref": [
      "r425",
      "r437",
      "r465",
      "r466",
      "r469",
      "r471"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_PremiumsEarnedNet",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of earned premiums ceded to other entities.",
        "label": "Ceded Premiums Earned",
        "negatedTerseLabel": "Ceded, Earned"
       }
      }
     },
     "localname": "CededPremiumsEarned",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CededPremiumsWritten": {
     "auth_ref": [
      "r469",
      "r471"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_PremiumsWrittenNet",
       "weight": -1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_PremiumsWrittenNet",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of written premiums ceded to other entities.",
        "label": "Ceded Premiums Written",
        "negatedLabel": "Ceded premiums",
        "negatedTerseLabel": "Ceded premiums"
       }
      }
     },
     "localname": "CededPremiumsWritten",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CertificatesOfDepositMember": {
     "auth_ref": [
      "r393"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Short to medium-term investment available at banks and savings and loan institutions where a customer agrees to lend money to the institution for a certain amount of time and is paid a predetermined rate of interest. Certificates of deposit (CD) are typically Federal Deposit Insurance Corporation (FDIC) insured.",
        "label": "Certificates of Deposit [Member]",
        "terseLabel": "Long-term Certificates of Deposit (CDs), at cost"
       }
      }
     },
     "localname": "CertificatesOfDepositMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ClassOfStockDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Share of stock differentiated by the voting rights the holder receives. Examples include, but are not limited to, common stock, redeemable preferred stock, nonredeemable preferred stock, and convertible stock.",
        "label": "Class of Stock [Domain]",
        "terseLabel": "Class of Stock"
       }
      }
     },
     "localname": "ClassOfStockDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement",
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquityCommonandPreferredStockDividendsDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquitySharesRollforwardDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ClassOfStockLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Class of Stock [Line Items]",
        "terseLabel": "Class of Stock"
       }
      }
     },
     "localname": "ClassOfStockLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityCommonandPreferredStockDividendsDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquitySharesRollforwardDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_CommercialMortgageBackedSecuritiesMember": {
     "auth_ref": [
      "r161",
      "r250"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Securities collateralized by commercial real estate mortgage loans.",
        "label": "Commercial Mortgage Backed Securities [Member]",
        "terseLabel": "Commercial mortgage-backed securities"
       }
      }
     },
     "localname": "CommercialMortgageBackedSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CommitmentsAndContingenciesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Commitments and Contingencies Disclosure [Abstract]",
        "terseLabel": "Commitments and Contingencies Disclosure [Abstract]"
       }
      }
     },
     "localname": "CommitmentsAndContingenciesDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_CommitmentsAndContingenciesDisclosureTextBlock": {
     "auth_ref": [
      "r221",
      "r224"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for commitments and contingencies.",
        "label": "Commitments and Contingencies Disclosure [Text Block]",
        "terseLabel": "Contingencies"
       }
      }
     },
     "localname": "CommitmentsAndContingenciesDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/Contingencies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CommonStockDividendsPerShareCashPaid": {
     "auth_ref": [
      "r243"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate dividends paid during the period for each share of common stock outstanding.",
        "label": "Common Stock, Dividends, Per Share, Cash Paid",
        "terseLabel": "Common Stock, Dividend Per Share"
       }
      }
     },
     "localname": "CommonStockDividendsPerShareCashPaid",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityCommonandPreferredStockDividendsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_CommonStockMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Stock that is subordinate to all other stock of the issuer.",
        "label": "Common Stock [Member]",
        "terseLabel": "Common stock",
        "verboseLabel": "Common Stock, par value $0.01 per share"
       }
      }
     },
     "localname": "CommonStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity",
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement",
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquityCommonandPreferredStockDividendsDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquitySharesRollforwardDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CommonStockParOrStatedValuePerShare": {
     "auth_ref": [
      "r14"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face amount or stated value per share of common stock.",
        "label": "Common Stock, Par or Stated Value Per Share",
        "terseLabel": "Common stock, par value (in dollars per share)"
       }
      }
     },
     "localname": "CommonStockParOrStatedValuePerShare",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_CommonStockSharesAuthorized": {
     "auth_ref": [
      "r14"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The maximum number of common shares permitted to be issued by an entity's charter and bylaws.",
        "label": "Common Stock, Shares Authorized",
        "terseLabel": "Common Stock, Shares Authorized"
       }
      }
     },
     "localname": "CommonStockSharesAuthorized",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockSharesIssued": {
     "auth_ref": [
      "r14"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.",
        "label": "Common Stock, Shares, Issued",
        "periodEndLabel": "Common Stock, ending balance (in shares)",
        "periodStartLabel": "Common Stock, beginning balance (in shares)",
        "terseLabel": "Common Stock, Issued (in shares)"
       }
      }
     },
     "localname": "CommonStockSharesIssued",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/StockholdersEquitySharesRollforwardDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockSharesOutstanding": {
     "auth_ref": [
      "r14",
      "r236"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.",
        "label": "Common Stock, Shares, Outstanding",
        "terseLabel": "Common Stock, Outstanding (in shares)"
       }
      }
     },
     "localname": "CommonStockSharesOutstanding",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/StockholdersEquitySharesRollforwardDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockValue": {
     "auth_ref": [
      "r14"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 2.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.",
        "label": "Common Stock, Value, Issued",
        "terseLabel": "Common stock, $0.01 par value - authorized 150,000,000 shares, issued 113,934,259 and 113,368,811 shares - 2020 and 2019, outstanding 113,475,176 and 113,368,811 shares - 2020 and 2019"
       }
      }
     },
     "localname": "CommonStockValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ComprehensiveIncomeNetOfTax": {
     "auth_ref": [
      "r48",
      "r50",
      "r51"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.",
        "label": "Comprehensive Income (Loss), Net of Tax, Attributable to Parent",
        "totalLabel": "Comprehensive income attributable to NGHC"
       }
      }
     },
     "localname": "ComprehensiveIncomeNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r48",
      "r50",
      "r291",
      "r301"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": 1.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.",
        "label": "Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest",
        "totalLabel": "Comprehensive income"
       }
      }
     },
     "localname": "ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CorporateAndOtherMember": {
     "auth_ref": [
      "r122"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Component of an entity that provides financial and operational oversight and administrative support for other segments and other segments not separately reported due to size or nature of business activities. Excludes intersegment elimination and reconciling items.",
        "label": "Corporate and Other [Member]",
        "terseLabel": "Corporate and Other"
       }
      }
     },
     "localname": "CorporateAndOtherMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CorporateBondSecuritiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This category includes information about long-term debt securities that are issued by either a domestic or foreign corporate business entity with a date certain promise of repayment and a return to the holder for the time value of money (for example, variable or fixed interest, original issue discount).",
        "label": "Corporate Bond Securities [Member]",
        "terseLabel": "Corporate bonds"
       }
      }
     },
     "localname": "CorporateBondSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAllowanceForCreditLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CorporateDebtSecuritiesMember": {
     "auth_ref": [
      "r250",
      "r253",
      "r476"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt securities issued by domestic or foreign corporate business, banks and other entities with a promise of repayment.",
        "label": "Corporate Debt Securities [Member]",
        "terseLabel": "Corporate Debt Securities"
       }
      }
     },
     "localname": "CorporateDebtSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CostmethodInvestmentsMember": {
     "auth_ref": [
      "r178",
      "r179",
      "r180",
      "r181",
      "r182",
      "r183"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investment in the stock of an investee recognized as cost-method.",
        "label": "Cost-method Investments [Member]",
        "terseLabel": "Investments, at cost or amortized cost"
       }
      }
     },
     "localname": "CostmethodInvestmentsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CreditFacilityAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of credit facility. Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.",
        "label": "Credit Facility [Axis]",
        "terseLabel": "Credit Facility"
       }
      }
     },
     "localname": "CreditFacilityAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_CreditFacilityDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of credit facility. Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.",
        "label": "Credit Facility [Domain]",
        "terseLabel": "Credit Facility"
       }
      }
     },
     "localname": "CreditFacilityDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CreditLossAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Credit Loss [Abstract]"
       }
      }
     },
     "localname": "CreditLossAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_CreditLossFinancialInstrumentPolicyTextBlock": {
     "auth_ref": [
      "r188",
      "r194",
      "r196",
      "r197",
      "r204"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for credit loss on financial instrument measured at amortized cost basis, net investment in lease, off-balance sheet credit exposure, and available-for-sale debt security. Includes, but is not limited to, methodology used to estimate allowance for credit loss, how writeoff of uncollectible amount is recognized, and determination of past due status and nonaccrual status.",
        "label": "Credit Loss, Financial Instrument [Policy Text Block]",
        "terseLabel": "Investment Impairments"
       }
      }
     },
     "localname": "CreditLossFinancialInstrumentPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RecentAccountingPronouncementsPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.",
        "label": "Cumulative Effect of New Accounting Principle in Period of Adoption",
        "terseLabel": "Cumulative Effect of New Accounting Principle in Period of Adoption",
        "verboseLabel": "Cumulative effect of new accounting principle in period of adoption on retained earnings"
       }
      }
     },
     "localname": "CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity",
      "http://www.nationalgeneral.com/role/RecentAccountingPronouncementsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Debt Disclosure [Abstract]",
        "terseLabel": "Debt Disclosure [Abstract]"
       }
      }
     },
     "localname": "DebtDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtDisclosureTextBlock": {
     "auth_ref": [
      "r232"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.",
        "label": "Debt Disclosure [Text Block]",
        "terseLabel": "Debt"
       }
      }
     },
     "localname": "DebtDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/Debt"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DebtInstrumentAxis": {
     "auth_ref": [
      "r7",
      "r9",
      "r10",
      "r367",
      "r369",
      "r402"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of debt instrument, including, but not limited to, draws against credit facilities.",
        "label": "Debt Instrument [Axis]",
        "terseLabel": "Debt Instrument"
       }
      }
     },
     "localname": "DebtInstrumentAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
      "http://www.nationalgeneral.com/role/DebtSeniorNotesDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentBasisSpreadOnVariableRate1": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage points added to the reference rate to compute the variable rate on the debt instrument.",
        "label": "Debt Instrument, Basis Spread on Variable Rate",
        "terseLabel": "Basis Spread on Variable Rate"
       }
      }
     },
     "localname": "DebtInstrumentBasisSpreadOnVariableRate1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentCarryingAmount": {
     "auth_ref": [
      "r10",
      "r228",
      "r369",
      "r402"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.",
        "label": "Long-term Debt, Gross",
        "terseLabel": "Total principal amount of debt"
       }
      }
     },
     "localname": "DebtInstrumentCarryingAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentDescriptionOfVariableRateBasis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.",
        "label": "Debt Instrument, Description of Variable Rate Basis",
        "terseLabel": "LIBOR",
        "verboseLabel": "Federal funds"
       }
      }
     },
     "localname": "DebtInstrumentDescriptionOfVariableRateBasis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentInterestRateEffectivePercentage": {
     "auth_ref": [
      "r25",
      "r230",
      "r331"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.",
        "label": "Debt Instrument, Interest Rate, Effective Percentage",
        "terseLabel": "Interest rate on subordinated debentures"
       }
      }
     },
     "localname": "DebtInstrumentInterestRateEffectivePercentage",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentInterestRateStatedPercentage": {
     "auth_ref": [
      "r25"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contractual interest rate for funds borrowed, under the debt agreement.",
        "label": "Debt Instrument, Interest Rate, Stated Percentage",
        "terseLabel": "Interest rate on debt"
       }
      }
     },
     "localname": "DebtInstrumentInterestRateStatedPercentage",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
      "http://www.nationalgeneral.com/role/DebtSeniorNotesDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Debt Instrument [Line Items]",
        "terseLabel": "Debt Instrument"
       }
      }
     },
     "localname": "DebtInstrumentLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
      "http://www.nationalgeneral.com/role/DebtSeniorNotesDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentNameDomain": {
     "auth_ref": [
      "r26"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The name for the particular debt instrument or borrowing that distinguishes it from other debt instruments or borrowings, including draws against credit facilities.",
        "label": "Debt Instrument, Name [Domain]",
        "terseLabel": "Debt Instrument, Name"
       }
      }
     },
     "localname": "DebtInstrumentNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
      "http://www.nationalgeneral.com/role/DebtSeniorNotesDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtInstrumentRedemptionPricePercentage": {
     "auth_ref": [
      "r394"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.",
        "label": "Debt Instrument, Redemption Price, Percentage",
        "terseLabel": "Debt Instrument, Redemption Price, Percentage"
       }
      }
     },
     "localname": "DebtInstrumentRedemptionPricePercentage",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentTable": {
     "auth_ref": [
      "r26",
      "r97",
      "r237",
      "r240",
      "r241",
      "r242",
      "r330",
      "r331",
      "r333",
      "r395"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A table or schedule providing information pertaining to long-term debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.",
        "label": "Schedule of Long-term Debt Instruments [Table]",
        "terseLabel": "Schedule of Long-term Debt Instruments"
       }
      }
     },
     "localname": "DebtInstrumentTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
      "http://www.nationalgeneral.com/role/DebtSeniorNotesDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss": {
     "auth_ref": [
      "r152",
      "r200",
      "r206",
      "r209"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale, Allowance for Credit Loss",
        "negatedLabel": "Allowance for Credit Losses",
        "periodEndLabel": "Balance, end of the period",
        "periodStartLabel": "Balance, beginning of the period",
        "terseLabel": "Debt securities, available-for sale, allowance for expected credit losses"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/InvestmentsAllowanceForCreditLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded": {
     "auth_ref": [
      "r207"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded.",
        "label": "Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded",
        "verboseLabel": "Additions to the allowance for credit losses on securities not previously recorded"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAllowanceForCreditLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease": {
     "auth_ref": [
      "r210"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet",
       "weight": -1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in allowance for credit loss of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)",
        "terseLabel": "Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]",
        "terseLabel": "Debt Securities, Available-for-sale, Allowance for Credit Loss"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAllowanceForCreditLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold": {
     "auth_ref": [
      "r208"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from sale.",
        "label": "Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold",
        "negatedTerseLabel": "Decreases to the allowance for credit losses for securities sold"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAllowanceForCreditLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossTable": {
     "auth_ref": [
      "r210"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale, Allowance for Credit Loss [Table]",
        "terseLabel": "Debt Securities, Available-for-sale, Allowance for Credit Loss"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAllowanceForCreditLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossTableTextBlock": {
     "auth_ref": [
      "r210"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Debt Securities, Available-for-sale, Allowance for Credit Loss [Table Text Block]",
        "terseLabel": "Debt Securities, Available-for-sale, Allowance for Credit Loss"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableForSaleAllowanceForCreditLossTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal": {
     "auth_ref": [
      "r201",
      "r205"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from change in present value of expected cash flows.",
        "label": "Debt Securities, Available-for-sale, Change in Present Value, Expense (Reversal)",
        "negatedTerseLabel": "Debt Securities, Available-for-sale, Change in Present Value, Expense (Reversal)",
        "terseLabel": "Decrease to the allowance for losses"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAllowanceForCreditLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtSecuritiesAvailableforsaleAllowanceForCreditLossLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]",
        "terseLabel": "Debt Securities, Available-for-sale, Allowance for Credit Loss"
       }
      }
     },
     "localname": "DebtSecuritiesAvailableforsaleAllowanceForCreditLossLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAllowanceForCreditLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtSecuritiesMember": {
     "auth_ref": [
      "r170"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt instrument issued by corporations, governments and governmental agencies, municipalities, and other institutions.",
        "label": "Debt Securities [Member]",
        "terseLabel": "Debt securities, available-for-sale"
       }
      }
     },
     "localname": "DebtSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense": {
     "auth_ref": [
      "r84",
      "r396",
      "r430",
      "r442",
      "r444",
      "r447",
      "r461"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of amortization expense (reversal of expense) for deferred policy acquisition costs.",
        "label": "Deferred Policy Acquisition Costs, Amortization Expense",
        "negatedTerseLabel": "Amortization"
       }
      }
     },
     "localname": "DeferredPolicyAcquisitionCostAmortizationExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredPolicyAcquisitionCosts": {
     "auth_ref": [
      "r415",
      "r444",
      "r445",
      "r447",
      "r461",
      "r477"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 6.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of deferred policy acquisition cost capitalized on contract remaining in force.",
        "label": "Deferred Policy Acquisition Cost",
        "terseLabel": "Deferred acquisition costs (Exchanges - $18,507 and $23,307)",
        "verboseLabel": "Deferred acquisition costs"
       }
      }
     },
     "localname": "DeferredPolicyAcquisitionCosts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredPolicyAcquisitionCostsAdditions": {
     "auth_ref": [
      "r444",
      "r447",
      "r461"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of deferred policy acquisition cost capitalized.",
        "label": "Deferred Policy Acquisition Cost, Capitalization",
        "terseLabel": "Additions"
       }
      }
     },
     "localname": "DeferredPolicyAcquisitionCostsAdditions",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired": {
     "auth_ref": [
      "r400",
      "r424",
      "r441"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after accumulated amortization, of deferred policy acquisition costs and present value of future profits from insurance contract acquired in business combination.",
        "label": "Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net",
        "periodEndLabel": "Balance, end of the period",
        "periodStartLabel": "Balance, beginning of the period"
       }
      }
     },
     "localname": "DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease": {
     "auth_ref": [
      "r444",
      "r461"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in deferred policy acquisition cost.",
        "label": "Deferred Policy Acquisition Costs, Period Increase (Decrease)",
        "totalLabel": "Change in DAC"
       }
      }
     },
     "localname": "DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredPolicyAcquisitionCostsTableTextBlock": {
     "auth_ref": [
      "r443",
      "r446",
      "r447",
      "r461"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the movement in deferred policy acquisition costs.",
        "label": "Deferred Policy Acquisition Costs [Table Text Block]",
        "terseLabel": "Deferred Policy Acquisition Costs"
       }
      }
     },
     "localname": "DeferredPolicyAcquisitionCostsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DeferredPolicyAcquisitionCostsTextBlock1": {
     "auth_ref": [
      "r448"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for deferred policy acquisition costs.",
        "label": "Deferred Policy Acquisition Costs [Text Block]",
        "terseLabel": "Deferred Acquisition Costs"
       }
      }
     },
     "localname": "DeferredPolicyAcquisitionCostsTextBlock1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCosts"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DepreciationDepletionAndAmortization": {
     "auth_ref": [
      "r84",
      "r128"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 4.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.",
        "label": "Depreciation, Depletion and Amortization",
        "terseLabel": "Depreciation and amortization"
       }
      }
     },
     "localname": "DepreciationDepletionAndAmortization",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.",
        "label": "Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities",
        "terseLabel": "Preferred stock dividends - convertible"
       }
      }
     },
     "localname": "DilutiveSecuritiesEffectOnBasicEarningsPerShareOther",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DirectPremiumsEarned": {
     "auth_ref": [
      "r425",
      "r436",
      "r467",
      "r470"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": 2.0,
       "parentTag": "nghc_PremiumsEarnedGross",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums earned.",
        "label": "Direct Premiums Earned",
        "terseLabel": "Direct, Earned"
       }
      }
     },
     "localname": "DirectPremiumsEarned",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DirectPremiumsWritten": {
     "auth_ref": [
      "r467"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_PremiumsWrittenNet",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written.",
        "label": "Direct Premiums Written",
        "terseLabel": "Direct, Written"
       }
      }
     },
     "localname": "DirectPremiumsWritten",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock": {
     "auth_ref": [
      "r282"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for share-based payment arrangement.",
        "label": "Share-based Payment Arrangement [Text Block]",
        "terseLabel": "Stock-Based Compensation"
       }
      }
     },
     "localname": "DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensation"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Share-based Payment Arrangement [Abstract]",
        "terseLabel": "Share-based Payment Arrangement [Abstract]"
       }
      }
     },
     "localname": "DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DividendsCommonStockCash": {
     "auth_ref": [
      "r243"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.",
        "label": "Dividends, Common Stock, Cash",
        "negatedTerseLabel": "Common stock dividends declared"
       }
      }
     },
     "localname": "DividendsCommonStockCash",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DividendsDeclaredTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of information related to dividends declared, including paid and unpaid dividends.",
        "label": "Dividends Declared [Table Text Block]",
        "terseLabel": "Dividends Declared"
       }
      }
     },
     "localname": "DividendsDeclaredTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DividendsPayableCurrentAndNoncurrent": {
     "auth_ref": [
      "r9",
      "r11",
      "r368",
      "r408"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.",
        "label": "Dividends Payable",
        "terseLabel": "Dividends Payable"
       }
      }
     },
     "localname": "DividendsPayableCurrentAndNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DividendsPayableDateDeclaredDayMonthAndYear": {
     "auth_ref": [
      "r87"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Date the dividend to be paid was declared, in CCYY-MM-DD format.",
        "label": "Dividends Payable, Date Declared",
        "terseLabel": "Declaration Date"
       }
      }
     },
     "localname": "DividendsPayableDateDeclaredDayMonthAndYear",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityCommonandPreferredStockDividendsDetails"
     ],
     "xbrltype": "dateItemType"
    },
    "us-gaap_DividendsPayableLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Dividends Payable [Line Items]",
        "terseLabel": "Dividends Payable"
       }
      }
     },
     "localname": "DividendsPayableLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DividendsPayableTable": {
     "auth_ref": [
      "r87"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A table that contains information regarding dividends that have been declared but not paid as of the financial reporting date. This information may contain the amount, amount per share, declared date, and date to be paid.",
        "label": "Dividends Payable [Table]",
        "terseLabel": "Dividends Payable"
       }
      }
     },
     "localname": "DividendsPayableTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DividendsPreferredStockCash": {
     "auth_ref": [
      "r243",
      "r392"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.",
        "label": "Dividends, Preferred Stock, Cash",
        "negatedTerseLabel": "Preferred stock dividends declared"
       }
      }
     },
     "localname": "DividendsPreferredStockCash",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EarningsPerShareAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Earnings Per Share [Abstract]",
        "terseLabel": "Earnings Per Share (\u201cEPS\u201d) attributable to NGHC common stockholders:"
       }
      }
     },
     "localname": "EarningsPerShareAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EarningsPerShareBasic": {
     "auth_ref": [
      "r58",
      "r102",
      "r108",
      "r113",
      "r114",
      "r115",
      "r117",
      "r383",
      "r428"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.",
        "label": "Earnings Per Share, Basic",
        "terseLabel": "Basic EPS"
       }
      }
     },
     "localname": "EarningsPerShareBasic",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_EarningsPerShareBasicAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Earnings Per Share, Basic [Abstract]",
        "terseLabel": "Earnings Per Share, Basic"
       }
      }
     },
     "localname": "EarningsPerShareBasicAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EarningsPerShareDiluted": {
     "auth_ref": [
      "r58",
      "r102",
      "r108",
      "r113",
      "r114",
      "r115",
      "r117",
      "r383",
      "r428"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.",
        "label": "Earnings Per Share, Diluted",
        "terseLabel": "Diluted EPS"
       }
      }
     },
     "localname": "EarningsPerShareDiluted",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_EarningsPerShareDilutedAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Earnings Per Share, Diluted [Abstract]",
        "terseLabel": "Earnings Per Share, Diluted"
       }
      }
     },
     "localname": "EarningsPerShareDilutedAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EarningsPerShareDilutedLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]",
        "terseLabel": "Earnings Per Share, Diluted"
       }
      }
     },
     "localname": "EarningsPerShareDilutedLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EarningsPerShareTextBlock": {
     "auth_ref": [
      "r118"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for earnings per share.",
        "label": "Earnings Per Share [Text Block]",
        "terseLabel": "Earnings Per Share"
       }
      }
     },
     "localname": "EarningsPerShareTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShare"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents": {
     "auth_ref": [
      "r321"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 4.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.",
        "label": "Effect of Exchange Rate on Cash and Cash Equivalents",
        "terseLabel": "Effect of exchange rate changes on cash and cash equivalents"
       }
      }
     },
     "localname": "EffectOfExchangeRateOnCashAndCashEquivalents",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EffectiveIncomeTaxRateContinuingOperations": {
     "auth_ref": [
      "r98",
      "r283",
      "r284"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.",
        "label": "Effective Income Tax Rate Reconciliation, Percent",
        "verboseLabel": "Effective Income Tax Rate, Percent"
       }
      }
     },
     "localname": "EffectiveIncomeTaxRateContinuingOperations",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/IncomeTaxesDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_EffectsOfReinsuranceTableTextBlock": {
     "auth_ref": [
      "r473"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the effects of reinsurance, for example, but not limited to, disclosure of direct, assumed, and ceded insurance.",
        "label": "Effects of Reinsurance [Table Text Block]",
        "terseLabel": "Schedule of Effect of Reinsurance on Unpaid Loss and LAE Reserves and Unearned Premiums"
       }
      }
     },
     "localname": "EffectsOfReinsuranceTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized": {
     "auth_ref": [
      "r276"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cost not yet recognized for nonvested award under share-based payment arrangement.",
        "label": "Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount",
        "terseLabel": "Unrecognized compensation cost"
       }
      }
     },
     "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1": {
     "auth_ref": [
      "r276"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition",
        "terseLabel": "Future period share-based compensation expense period of recognition (in years)"
       }
      }
     },
     "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_EmployeeStockOptionMember": {
     "auth_ref": [
      "r274"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Share-based payment arrangement granting right, subject to vesting and other restrictions, to purchase or sell certain number of shares at predetermined price for specified period of time.",
        "label": "Share-based Payment Arrangement, Option [Member]",
        "terseLabel": "Employee stock options"
       }
      }
     },
     "localname": "EmployeeStockOptionMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Revenue from External Customer [Line Items]",
        "terseLabel": "Revenue from External Customer"
       }
      }
     },
     "localname": "EntityWideInformationRevenueFromExternalCustomerLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Equity [Abstract]",
        "terseLabel": "Equity [Abstract]"
       }
      }
     },
     "localname": "EquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_EquityComponentDomain": {
     "auth_ref": [
      "r236"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Components of equity are the parts of the total Equity balance including that which is allocated to common, preferred, treasury stock, retained earnings, etc.",
        "label": "Equity Component [Domain]",
        "terseLabel": "Equity Component"
       }
      }
     },
     "localname": "EquityComponentDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EquityMethodInvestmentDividendsOrDistributions": {
     "auth_ref": [
      "r56",
      "r79",
      "r84",
      "r426"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.",
        "label": "Proceeds from Equity Method Investment, Distribution",
        "negatedTerseLabel": "Proceeds from Equity Method Investment, Distribution",
        "terseLabel": "Distributions"
       }
      }
     },
     "localname": "EquityMethodInvestmentDividendsOrDistributions",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EquityMethodInvestmentOwnershipPercentage": {
     "auth_ref": [
      "r175"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.",
        "label": "Equity Method Investment, Ownership Percentage",
        "terseLabel": "Ownership percentage"
       }
      }
     },
     "localname": "EquityMethodInvestmentOwnershipPercentage",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_EquityMethodInvestments": {
     "auth_ref": [
      "r22",
      "r132",
      "r173"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.",
        "label": "Equity Method Investments",
        "terseLabel": "Equity investment in unconsolidated subsidiaries"
       }
      }
     },
     "localname": "EquityMethodInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EquityMethodInvestmentsMember": {
     "auth_ref": [
      "r172"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investment in the stock of an investee which is adjusted for the investor's share of the earnings or losses of the investee after the date of acquisition.",
        "label": "Equity Method Investments [Member]",
        "terseLabel": "Equity method investments"
       }
      }
     },
     "localname": "EquityMethodInvestmentsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]",
        "terseLabel": "Fair Value Assets Measured on Recurring and Nonrecurring Basis"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable": {
     "auth_ref": [
      "r304",
      "r305",
      "r306",
      "r315"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about asset and liability measured at fair value on recurring and nonrecurring basis.",
        "label": "Fair Value, Recurring and Nonrecurring [Table]",
        "terseLabel": "Fair Value Measurements, Recurring and Nonrecurring"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss": {
     "auth_ref": [
      "r313"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.",
        "label": "Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)",
        "terseLabel": "Change in unrealized gains (losses) for the period included in net income for assets held at the end of the reporting period"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]",
        "terseLabel": "Fair Value, Balance Sheet Grouping, Financial Statement Captions"
       }
      }
     },
     "localname": "FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByBalanceSheetGroupingTable": {
     "auth_ref": [
      "r304",
      "r318",
      "r319"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.",
        "label": "Fair Value, by Balance Sheet Grouping [Table]",
        "terseLabel": "Fair Value, by Balance Sheet Grouping"
       }
      }
     },
     "localname": "FairValueByBalanceSheetGroupingTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByBalanceSheetGroupingTextBlock": {
     "auth_ref": [
      "r304",
      "r318"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.",
        "label": "Fair Value, by Balance Sheet Grouping [Table Text Block]",
        "terseLabel": "Fair Value, by Balance Sheet Grouping"
       }
      }
     },
     "localname": "FairValueByBalanceSheetGroupingTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueByFairValueHierarchyLevelAxis": {
     "auth_ref": [
      "r250",
      "r251",
      "r253",
      "r305",
      "r346"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by level within fair value hierarchy and fair value measured at net asset value per share as practical expedient.",
        "label": "Fair Value Hierarchy and NAV [Axis]",
        "terseLabel": "Fair Value, Hierarchy",
        "verboseLabel": "Fair Value, Hierarchy"
       }
      }
     },
     "localname": "FairValueByFairValueHierarchyLevelAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByMeasurementFrequencyAxis": {
     "auth_ref": [
      "r304",
      "r305",
      "r307",
      "r308",
      "r316"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by measurement frequency.",
        "label": "Measurement Frequency [Axis]",
        "terseLabel": "Measurement Frequency"
       }
      }
     },
     "localname": "FairValueByMeasurementFrequencyAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueDisclosuresAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Fair Value Disclosures [Abstract]",
        "terseLabel": "Fair Value Disclosures [Abstract]"
       }
      }
     },
     "localname": "FairValueDisclosuresAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueDisclosuresTextBlock": {
     "auth_ref": [
      "r314"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.",
        "label": "Fair Value Disclosures [Text Block]",
        "terseLabel": "Fair Value of Financial Instruments"
       }
      }
     },
     "localname": "FairValueDisclosuresTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstruments"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueInputsLevel1Member": {
     "auth_ref": [
      "r250",
      "r251",
      "r253",
      "r305",
      "r347"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Quoted prices in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.",
        "label": "Fair Value, Inputs, Level 1 [Member]",
        "terseLabel": "Level 1"
       }
      }
     },
     "localname": "FairValueInputsLevel1Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel2Member": {
     "auth_ref": [
      "r250",
      "r251",
      "r253",
      "r305",
      "r348"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Inputs other than quoted prices included within level 1 that are observable for an asset or liability, either directly or indirectly, including, but not limited to, quoted prices for similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in inactive markets.",
        "label": "Fair Value, Inputs, Level 2 [Member]",
        "terseLabel": "Level 2"
       }
      }
     },
     "localname": "FairValueInputsLevel2Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel3Member": {
     "auth_ref": [
      "r250",
      "r251",
      "r253",
      "r305",
      "r349"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.",
        "label": "Fair Value, Inputs, Level 3 [Member]",
        "terseLabel": "Level 3"
       }
      }
     },
     "localname": "FairValueInputsLevel3Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]",
        "terseLabel": "Fair Value Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation"
       }
      }
     },
     "localname": "FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueMeasurementFrequencyDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Measurement frequency.",
        "label": "Measurement Frequency [Domain]",
        "terseLabel": "Fair Value, Measurement Frequency"
       }
      }
     },
     "localname": "FairValueMeasurementFrequencyDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1": {
     "auth_ref": [
      "r310"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings",
        "terseLabel": "Total gains (losses) included in net income"
       }
      }
     },
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss": {
     "auth_ref": [
      "r311"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)",
        "terseLabel": "Total gains (losses) included in other comprehensive income"
       }
      }
     },
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales": {
     "auth_ref": [
      "r312"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales",
        "negatedTerseLabel": "Sales"
       }
      }
     },
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue": {
     "auth_ref": [
      "r309"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.",
        "label": "Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value",
        "periodEndLabel": "Balance as of",
        "periodStartLabel": "Balance as of"
       }
      }
     },
     "localname": "FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FairValueMeasurementsFairValueHierarchyDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Categories used to prioritize the inputs to valuation techniques to measure fair value.",
        "label": "Fair Value Hierarchy and NAV [Domain]",
        "terseLabel": "Fair Value Hierarchy"
       }
      }
     },
     "localname": "FairValueMeasurementsFairValueHierarchyDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementsRecurringMember": {
     "auth_ref": [
      "r314",
      "r316"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Frequent fair value measurement. Includes, but is not limited to, fair value adjustment for impairment of asset, liability or equity, frequently measured at fair value.",
        "label": "Fair Value, Recurring [Member]",
        "terseLabel": "Recurring"
       }
      }
     },
     "localname": "FairValueMeasurementsRecurringMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FederalFundsPurchasedMember": {
     "auth_ref": [
      "r376"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Short term borrowing where a bank borrows, at the federal funds rate, from another bank.",
        "label": "Federal Funds Purchased [Member]",
        "terseLabel": "Federal Funds Purchased"
       }
      }
     },
     "localname": "FederalFundsPurchasedMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FinanceLeaseLiability": {
     "auth_ref": [
      "r335",
      "r336"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from finance lease.",
        "label": "Finance Lease, Liability",
        "terseLabel": "Finance lease liabilities"
       }
      }
     },
     "localname": "FinanceLeaseLiability",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinancialInstrumentAxis": {
     "auth_ref": [
      "r188",
      "r193",
      "r194",
      "r195",
      "r198",
      "r203",
      "r204",
      "r210",
      "r211"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of financial instrument.",
        "label": "Financial Instrument [Axis]",
        "terseLabel": "Financial Instrument"
       }
      }
     },
     "localname": "FinancialInstrumentAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAllowanceForCreditLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ForeignGovernmentDebtSecuritiesMember": {
     "auth_ref": [
      "r250",
      "r476"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debt security issued by government not domiciled in United States of America (US).",
        "label": "Debt Security, Government, Non-US [Member]",
        "terseLabel": "Foreign government"
       }
      }
     },
     "localname": "ForeignGovernmentDebtSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_GainLossOnInvestments": {
     "auth_ref": [
      "r64",
      "r84",
      "r148"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 2.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      },
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 5.0,
       "parentTag": "us-gaap_Revenues",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of realized and unrealized gain (loss) on investment.",
        "label": "Gain (Loss) on Investments",
        "negatedLabel": "Net (gain) loss on investments",
        "terseLabel": "Net gain (loss) on investments",
        "verboseLabel": "Net realized gain (loss) on Investments"
       }
      }
     },
     "localname": "GainLossOnInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GainLossOnInvestmentsTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of realized and unrealized gain (loss) on investment in security.",
        "label": "Gain (Loss) on Securities [Table Text Block]",
        "terseLabel": "Net Realized Gains (Losses)"
       }
      }
     },
     "localname": "GainLossOnInvestmentsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_GeneralAndAdministrativeExpense": {
     "auth_ref": [
      "r61"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 3.0,
       "parentTag": "us-gaap_BenefitsLossesAndExpenses",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_OperatingExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.",
        "label": "General and Administrative Expense",
        "terseLabel": "General and administrative expenses"
       }
      }
     },
     "localname": "GeneralAndAdministrativeExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_Goodwill": {
     "auth_ref": [
      "r212",
      "r213"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 11.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.",
        "label": "Goodwill",
        "terseLabel": "Goodwill"
       }
      }
     },
     "localname": "Goodwill",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GrossInvestmentIncomeOperating": {
     "auth_ref": [
      "r432"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_NetInvestmentIncome",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.",
        "label": "Gross Investment Income, Operating",
        "totalLabel": "Investment income"
       }
      }
     },
     "localname": "GrossInvestmentIncomeOperating",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GroupPoliciesMember": {
     "auth_ref": [
      "r459",
      "r460"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contract consisting of insurance coverage issued to organization to provide benefit to more than one individual.",
        "label": "Group Insurance Policy [Member]",
        "terseLabel": "Group"
       }
      }
     },
     "localname": "GroupPoliciesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest": {
     "auth_ref": [
      "r55",
      "r102",
      "r363",
      "r381",
      "r431"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 1.0,
       "parentTag": "us-gaap_ProfitLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.",
        "label": "Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest",
        "terseLabel": "Income before provision for income taxes"
       }
      }
     },
     "localname": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeLossFromEquityMethodInvestments": {
     "auth_ref": [
      "r56",
      "r84",
      "r129",
      "r173",
      "r380",
      "r426"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of income (loss) for proportionate share of equity method investee's income (loss).",
        "label": "Income (Loss) from Equity Method Investments",
        "terseLabel": "Income (Loss) from Equity Method Investments",
        "verboseLabel": "Equity in earnings (losses)"
       }
      }
     },
     "localname": "IncomeLossFromEquityMethodInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeStatementAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Income Statement [Abstract]",
        "terseLabel": "Income Statement [Abstract]"
       }
      }
     },
     "localname": "IncomeStatementAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeTaxDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Income Tax Disclosure [Abstract]",
        "terseLabel": "Income Tax Disclosure [Abstract]"
       }
      }
     },
     "localname": "IncomeTaxDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeTaxDisclosureTextBlock": {
     "auth_ref": [
      "r288"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.",
        "label": "Income Tax Disclosure [Text Block]",
        "terseLabel": "Income Taxes"
       }
      }
     },
     "localname": "IncomeTaxDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/IncomeTaxes"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_IncomeTaxExpenseBenefit": {
     "auth_ref": [
      "r91",
      "r130",
      "r286"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 2.0,
       "parentTag": "us-gaap_ProfitLoss",
       "weight": -1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.",
        "label": "Income Tax Expense (Benefit)",
        "negatedTerseLabel": "Provision for income taxes",
        "terseLabel": "Provision for income taxes"
       }
      }
     },
     "localname": "IncomeTaxExpenseBenefit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 8.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the amount due from customers for the credit sale of goods and services; includes accounts receivable and other types of receivables.",
        "label": "Increase (Decrease) in Accounts and Other Receivables",
        "negatedTerseLabel": "Premiums and other\u00a0receivables"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccountsAndOtherReceivables",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 16.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.",
        "label": "Increase (Decrease) in Accounts Payable and Accrued Liabilities",
        "terseLabel": "Accounts payable and accrued expenses"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccountsPayableAndAccruedLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 7.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in investment income that has been earned but not yet received in cash.",
        "label": "Increase (Decrease) in Accrued Investment Income Receivable",
        "negatedTerseLabel": "Accrued investment income"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccruedInvestmentIncomeReceivable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 9.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the balance sheet value of capitalized sales costs that are associated with acquiring a new insurance customers.",
        "label": "Increase (Decrease) in Deferred Policy Acquisition Costs",
        "negatedTerseLabel": "Deferred acquisition costs"
       }
      }
     },
     "localname": "IncreaseDecreaseInDeferredPolicyAcquisitionCosts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 13.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.",
        "label": "Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve",
        "terseLabel": "Unpaid loss and loss adjustment expense reserves"
       }
      }
     },
     "localname": "IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Increase (Decrease) in Operating Capital [Abstract]",
        "terseLabel": "Changes in assets and liabilities:"
       }
      }
     },
     "localname": "IncreaseDecreaseInOperatingCapitalAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncreaseDecreaseInOtherOperatingLiabilities": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 17.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in operating liabilities classified as other.",
        "label": "Increase (Decrease) in Other Operating Liabilities",
        "terseLabel": "Other liabilities"
       }
      }
     },
     "localname": "IncreaseDecreaseInOtherOperatingLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 12.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in prepaid expenses, and assets classified as other.",
        "label": "Increase (Decrease) in Prepaid Expense and Other Assets",
        "negatedTerseLabel": "Prepaid expenses and other assets"
       }
      }
     },
     "localname": "IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInPrepaidReinsurancePremiums": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 11.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The change in prepaid reinsurance premiums recorded on the balance sheet, which is needed to adjust net income to arrive at net cash flows provided by or used in operations.",
        "label": "Increase (Decrease) in Prepaid Reinsurance Premiums",
        "negatedTerseLabel": "Prepaid reinsurance premiums"
       }
      }
     },
     "localname": "IncreaseDecreaseInPrepaidReinsurancePremiums",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInReinsurancePayables": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 15.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the amount due to other insurance companies when the reporting entity has assumed a portion of the cedant's insurance risk which has resulted in insurance losses.",
        "label": "Increase (Decrease) in Reinsurance Payables",
        "terseLabel": "Reinsurance payable"
       }
      }
     },
     "localname": "IncreaseDecreaseInReinsurancePayables",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInReinsuranceRecoverable": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 10.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the amount of benefits the ceding insurer expects to recover on insurance policies ceded to other insurance entities as of the balance sheet date for all guaranteed benefit types.",
        "label": "Increase (Decrease) in Reinsurance Recoverable",
        "negatedTerseLabel": "Reinsurance recoverable"
       }
      }
     },
     "localname": "IncreaseDecreaseInReinsuranceRecoverable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInStockholdersEquityRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Increase (Decrease) in Stockholders' Equity [Roll Forward]",
        "terseLabel": "Increase (Decrease) in Stockholders' Equity"
       }
      }
     },
     "localname": "IncreaseDecreaseInStockholdersEquityRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncreaseDecreaseInUnearnedPremiums": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 14.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) unearned premiums written. Excludes portion of unearned premiums amortized into income.",
        "label": "Increase (Decrease) in Unearned Premiums",
        "terseLabel": "Unearned premiums and other revenue"
       }
      }
     },
     "localname": "IncreaseDecreaseInUnearnedPremiums",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInUnearnedPremiumsNet": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_PremiumsEarnedNet",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after premiums ceded to other entities and premiums assumed by the entity, of decrease (increase) in unearned premiums.",
        "label": "(Increase) Decrease in Unearned Premiums, Net",
        "terseLabel": "Change in unearned premium"
       }
      }
     },
     "localname": "IncreaseDecreaseInUnearnedPremiumsNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock": {
     "auth_ref": [
      "r111",
      "r116"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible preferred stock using the if-converted method.",
        "label": "Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock",
        "terseLabel": "Convertible preferred stock"
       }
      }
     },
     "localname": "IncrementalCommonSharesAttributableToConversionOfPreferredStock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements": {
     "auth_ref": [
      "r109",
      "r116"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.",
        "label": "Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements",
        "terseLabel": "Effect of dilutive securities"
       }
      }
     },
     "localname": "IncrementalCommonSharesAttributableToShareBasedPaymentArrangements",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_IndividualPoliciesMember": {
     "auth_ref": [
      "r459",
      "r460"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contract consisting of insurance coverage issued to individual.",
        "label": "Individual Insurance Policy [Member]",
        "terseLabel": "Individual"
       }
      }
     },
     "localname": "IndividualPoliciesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InsuranceAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Insurance [Abstract]",
        "terseLabel": "Insurance [Abstract]"
       }
      }
     },
     "localname": "InsuranceAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_InsuranceCommissionsAndFees": {
     "auth_ref": [
      "r384",
      "r433"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 3.0,
       "parentTag": "us-gaap_Revenues",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails": {
       "order": 1.0,
       "parentTag": "nghc_CedingCommissionandServiceandFeeIncome",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 3.0,
       "parentTag": "nghc_UnderwritingRevenue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Income from agency and brokerage operations (includes sales of annuities and supplemental contracts); service charges, commissions, and fees from the sale of insurance and related services; and management fees from separate accounts, deferred annuities, and universal life products.",
        "label": "Insurance Commissions and Fees",
        "terseLabel": "Service and fee income",
        "verboseLabel": "Service and fee income"
       }
      }
     },
     "localname": "InsuranceCommissionsAndFees",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IntangibleAssetsNetExcludingGoodwill": {
     "auth_ref": [
      "r215",
      "r216"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 10.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.",
        "label": "Intangible Assets, Net (Excluding Goodwill)",
        "terseLabel": "Intangible assets, net (Exchanges - $3,090 and $3,225)",
        "verboseLabel": "Intangible assets, net"
       }
      }
     },
     "localname": "IntangibleAssetsNetExcludingGoodwill",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IntangibleAssetsNetIncludingGoodwill": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.",
        "label": "Intangible Assets, Net (Including Goodwill)",
        "terseLabel": "Goodwill and Intangible assets, net"
       }
      }
     },
     "localname": "IntangibleAssetsNetIncludingGoodwill",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpense": {
     "auth_ref": [
      "r53",
      "r127",
      "r329",
      "r332",
      "r385"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 4.0,
       "parentTag": "us-gaap_BenefitsLossesAndExpenses",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 4.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of the cost of borrowed funds accounted for as interest expense.",
        "label": "Interest Expense",
        "negatedTerseLabel": "Interest expense",
        "terseLabel": "Interest expense"
       }
      }
     },
     "localname": "InterestExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestExpenseDebt": {
     "auth_ref": [
      "r65",
      "r231"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of the cost of borrowed funds accounted for as interest expense for debt.",
        "label": "Interest Expense, Debt",
        "terseLabel": "Interest Expense, Debt"
       }
      }
     },
     "localname": "InterestExpenseDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestIncomeAndInterestExpenseDisclosureTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of interest income and expense, including, but not limited to, interest income and expense from investments, loans, and securities.",
        "label": "Interest Income and Interest Expense Disclosure [Table Text Block]",
        "terseLabel": "Schedule of Interest Expense"
       }
      }
     },
     "localname": "InterestIncomeAndInterestExpenseDisclosureTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_InterestIncomeRelatedParty": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of interest income earned from interest-bearing assets owed to the entity by related party.",
        "label": "Interest Income, Related Party",
        "terseLabel": "Interest Income, related party"
       }
      }
     },
     "localname": "InterestIncomeRelatedParty",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InvestmentHoldingsTable": {
     "auth_ref": [
      "r484",
      "r486",
      "r488",
      "r489"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The investment holdings table is used for any listing of investments. The \"Investment [Axis]\" identifies the investment for which the line items apply. The other axes are used for categorizing the investments and creating useful subtotals. These axes cover different categorizations. The appropriate axes are expected to be used. Additional axes can be added for alternative categorizations.",
        "label": "Investment Holdings [Table]",
        "terseLabel": "Investment Holdings"
       }
      }
     },
     "localname": "InvestmentHoldingsTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InvestmentIncomeInterest": {
     "auth_ref": [
      "r63",
      "r126"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_GrossInvestmentIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.",
        "label": "Investment Income, Interest",
        "terseLabel": "Investment Income"
       }
      }
     },
     "localname": "InvestmentIncomeInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InvestmentIncomeInvestmentExpense": {
     "auth_ref": [
      "r66",
      "r432"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_NetInvestmentIncome",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expenses related to the generation of investment income.",
        "label": "Investment Income, Investment Expense",
        "negatedTerseLabel": "Investment expenses"
       }
      }
     },
     "localname": "InvestmentIncomeInvestmentExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InvestmentIncomeNet": {
     "auth_ref": [
      "r62",
      "r65",
      "r66"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_GrossInvestmentIncomeOperating",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.",
        "label": "Investment Income, Net",
        "terseLabel": "Investment Income, Net"
       }
      }
     },
     "localname": "InvestmentIncomeNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InvestmentIncomeTextBlock": {
     "auth_ref": [
      "r62",
      "r65",
      "r66",
      "r432"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of investment income, including, but not limited to, interest and dividend income and amortization of discount (premium) derived from debt and equity securities. Excludes realized and unrealized gain (loss) on investments.",
        "label": "Investment Income [Table Text Block]",
        "terseLabel": "Investment Income"
       }
      }
     },
     "localname": "InvestmentIncomeTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_InvestmentTextBlock": {
     "auth_ref": [
      "r170",
      "r171",
      "r177",
      "r185"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for investment.",
        "label": "Investment [Text Block]",
        "terseLabel": "Investment"
       }
      }
     },
     "localname": "InvestmentTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/Investments"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_InvestmentTypeAxis": {
     "auth_ref": [
      "r483",
      "r485",
      "r487",
      "r490"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of investments.",
        "label": "Investment Type [Axis]",
        "terseLabel": "Investment Type"
       }
      }
     },
     "localname": "InvestmentTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InvestmentTypeCategorizationMember": {
     "auth_ref": [
      "r483",
      "r485",
      "r487",
      "r490"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Asset obtained to generate income or appreciate in value.",
        "label": "Investments [Domain]",
        "terseLabel": "Investments"
       }
      }
     },
     "localname": "InvestmentTypeCategorizationMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_Investments": {
     "auth_ref": [
      "r418"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 1.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all investments.",
        "label": "Investments",
        "totalLabel": "Total investments"
       }
      }
     },
     "localname": "Investments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InvestmentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Investments [Abstract]",
        "terseLabel": "Investments:"
       }
      }
     },
     "localname": "InvestmentsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.",
        "label": "Investments Classified by Contractual Maturity Date [Table Text Block]",
        "terseLabel": "Available-for-Sale Debt Securities by Contractual Maturity"
       }
      }
     },
     "localname": "InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Investments, Debt and Equity Securities [Abstract]",
        "terseLabel": "Investments, Debt and Equity Securities [Abstract]"
       }
      }
     },
     "localname": "InvestmentsDebtAndEquitySecuritiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_InvestmentsFairValueDisclosure": {
     "auth_ref": [
      "r304"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.",
        "label": "Investments, Fair Value Disclosure",
        "terseLabel": "Total"
       }
      }
     },
     "localname": "InvestmentsFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LeaseAndRentalExpense": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.",
        "label": "Operating Leases, Rent Expense",
        "terseLabel": "Rent expense"
       }
      }
     },
     "localname": "LeaseAndRentalExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_Liabilities": {
     "auth_ref": [
      "r24"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 2.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.",
        "label": "Liabilities",
        "totalLabel": "Total liabilities"
       }
      }
     },
     "localname": "Liabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Liabilities [Abstract]",
        "terseLabel": "Liabilities:"
       }
      }
     },
     "localname": "LiabilitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilitiesAndStockholdersEquity": {
     "auth_ref": [
      "r20",
      "r371",
      "r413"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.",
        "label": "Liabilities and Equity",
        "totalLabel": "Total liabilities and stockholders\u2019 equity"
       }
      }
     },
     "localname": "LiabilitiesAndStockholdersEquity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesAndStockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Liabilities and Equity [Abstract]",
        "terseLabel": "LIABILITIES AND STOCKHOLDERS\u2019 EQUITY"
       }
      }
     },
     "localname": "LiabilitiesAndStockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis": {
     "auth_ref": [
      "r456"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of catastrophic event, for example, but not limited to, earthquake, windstorm, fire or explosion.",
        "label": "Catastrophic Event [Axis]",
        "terseLabel": "Catastrophic Event"
       }
      }
     },
     "localname": "LiabilityForCatastropheClaimsByCatastrophicEventAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense": {
     "auth_ref": [
      "r452",
      "r455"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 1.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.",
        "label": "Liability for Claims and Claims Adjustment Expense",
        "periodEndLabel": "Gross balance at end of the period",
        "periodStartLabel": "Gross balance at beginning of the period",
        "terseLabel": "Unpaid loss and loss adjustment expense reserves (Exchanges - $208,496 and $205,786)",
        "verboseLabel": "Unpaid loss and loss adjustment expense reserves"
       }
      }
     },
     "localname": "LiabilityForClaimsAndClaimsAdjustmentExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Liability for Claims and Claims Adjustment Expense [Abstract]",
        "terseLabel": "Loss and LAE expense:"
       }
      }
     },
     "localname": "LiabilityForClaimsAndClaimsAdjustmentExpenseAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Liability for Claims and Claims Adjustment Expense [Line Items]",
        "terseLabel": "Liability for Claims and Claims Adjustment Expense"
       }
      }
     },
     "localname": "LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about the liability for claims and claims adjustment expense.",
        "label": "Liability for Claims and Claims Adjustment Expense [Table]",
        "terseLabel": "Liability for Claims and Claims Adjustment Expense"
       }
      }
     },
     "localname": "LiabilityForClaimsAndClaimsAdjustmentExpenseTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilityForFuturePolicyBenefitsAndUnpaidClaimsDisclosureTextBlock": {
     "auth_ref": [
      "r462"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for liabilities related to future policy benefits and unpaid claims and claim adjustments.",
        "label": "Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block]",
        "terseLabel": "Unpaid Losses and Loss Adjustment Expense Reserves"
       }
      }
     },
     "localname": "LiabilityForFuturePolicyBenefitsAndUnpaidClaimsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReserves"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1": {
     "auth_ref": [
      "r454"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_PaymentsForLossesAndLossAdjustmentExpense",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs.",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year",
        "negatedTerseLabel": "Current year"
       }
      }
     },
     "localname": "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1": {
     "auth_ref": [
      "r454"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_PaymentsForLossesAndLossAdjustmentExpense",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs.",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years",
        "negatedTerseLabel": "Prior year"
       }
      }
     },
     "localname": "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of foreign currency gain (loss) which decreases (increases) the cost of settling unpaid claims after deduction of reinsurance recoveries. Includes, but is not limited to, claims which have been incurred but not reported.",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss)",
        "terseLabel": "Unrealized foreign exchange gain"
       }
      }
     },
     "localname": "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1": {
     "auth_ref": [
      "r453"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process.",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims",
        "totalLabel": "Total incurred"
       }
      }
     },
     "localname": "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet": {
     "auth_ref": [
      "r401",
      "r452",
      "r455"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims.",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense, Net",
        "periodEndLabel": "Net balance at end of the period",
        "periodStartLabel": "Net balance at beginning of the period"
       }
      }
     },
     "localname": "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LifeSettlementContractsInvestmentMethodNumberOfContracts": {
     "auth_ref": [
      "r184"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of life settlement contracts accounted for under the investment method.",
        "label": "Life Settlement Contracts, Investment Method, Number of Contracts",
        "terseLabel": "Life Settlement Contracts, Investment Method, Number of Contracts"
       }
      }
     },
     "localname": "LifeSettlementContractsInvestmentMethodNumberOfContracts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "us-gaap_LineOfCreditFacilityAxis": {
     "auth_ref": [
      "r23",
      "r97"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by name of lender, which may be a single entity (for example, but not limited to, a bank, pension fund, venture capital firm) or a group of entities that participate in the line of credit.",
        "label": "Lender Name [Axis]",
        "terseLabel": "Lender Name"
       }
      }
     },
     "localname": "LineOfCreditFacilityAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LineOfCreditFacilityCommitmentFeePercentage": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.",
        "label": "Line of Credit Facility, Commitment Fee Percentage",
        "terseLabel": "Line of Credit Facility, Commitment Fee Percentage"
       }
      }
     },
     "localname": "LineOfCreditFacilityCommitmentFeePercentage",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity": {
     "auth_ref": [
      "r23"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.",
        "label": "Line of Credit Facility, Current Borrowing Capacity",
        "terseLabel": "Line of Credit Facility, Current Borrowing Capacity"
       }
      }
     },
     "localname": "LineOfCreditFacilityCurrentBorrowingCapacity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd": {
     "auth_ref": [
      "r23"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The effective interest rate at the end of the reporting period.",
        "label": "Line of Credit Facility, Interest Rate at Period End",
        "terseLabel": "Interest rate on Credit Agreement"
       }
      }
     },
     "localname": "LineOfCreditFacilityInterestRateAtPeriodEnd",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_LineOfCreditFacilityLenderDomain": {
     "auth_ref": [
      "r23"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Identification of the lender, which may be a single entity (for example, a bank, pension fund, venture capital firm) or a group of entities that participate in the line of credit, including a letter of credit facility.",
        "label": "Line of Credit Facility, Lender [Domain]",
        "terseLabel": "Line of Credit Facility, Lender"
       }
      }
     },
     "localname": "LineOfCreditFacilityLenderDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Maximum amount borrowed under the credit facility at any time during the period.",
        "label": "Line of Credit Facility, Maximum Amount Outstanding During Period",
        "terseLabel": "Line of Credit Facility, Maximum Amount Outstanding During Period"
       }
      }
     },
     "localname": "LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LineOfCreditMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars.",
        "label": "Line of Credit [Member]",
        "terseLabel": "Line of Credit"
       }
      }
     },
     "localname": "LineOfCreditMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LoansMember": {
     "auth_ref": [
      "r144"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "When a lender gives money or property over other debt securities sold by the issuer. In the event the issuer goes bankrupt, senior debt holders receive priority for [must receive] repayment [prior] relative to junior and unsecured (general) creditors.",
        "label": "Loans [Member]",
        "terseLabel": "Loans"
       }
      }
     },
     "localname": "LoansMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LondonInterbankOfferedRateLIBORMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest rate at which a bank borrows funds from other banks in the London interbank market.",
        "label": "London Interbank Offered Rate (LIBOR) [Member]",
        "terseLabel": "LIBOR"
       }
      }
     },
     "localname": "LondonInterbankOfferedRateLIBORMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LongTermDebt": {
     "auth_ref": [
      "r10",
      "r229",
      "r369",
      "r409"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 5.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.",
        "label": "Long-term Debt",
        "terseLabel": "Debt",
        "verboseLabel": "Debt"
       }
      }
     },
     "localname": "LongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt and lease obligation, including portion classified as current.",
        "label": "Long-term Debt and Lease Obligation, Including Current Maturities",
        "totalLabel": "Carrying amount of debt"
       }
      }
     },
     "localname": "LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Principal amount of long-term debt and capital lease obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five",
        "terseLabel": "2025 and thereafter"
       }
      }
     },
     "localname": "LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Principal amount of long-term debt and capital lease obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five",
        "terseLabel": "2024"
       }
      }
     },
     "localname": "LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Principal amount of long-term debt and capital lease obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four",
        "terseLabel": "2023"
       }
      }
     },
     "localname": "LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Principal amount of long-term debt and capital lease obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Principal amount of long-term debt and capital lease obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "label": "Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two",
        "terseLabel": "2021"
       }
      }
     },
     "localname": "LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of long-term debt and capital lease obligation maturing in the remainder of the fiscal year following the latest fiscal year ended.",
        "label": "Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Remainder of Fiscal Year",
        "terseLabel": "2020 (remaining three months)"
       }
      }
     },
     "localname": "LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtFairValue": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.",
        "label": "Long-term Debt, Fair Value",
        "terseLabel": "Fair value estimates of debt"
       }
      }
     },
     "localname": "LongTermDebtFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongtermDebtTypeAxis": {
     "auth_ref": [
      "r26"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of long-term debt.",
        "label": "Long-term Debt, Type [Axis]",
        "terseLabel": "Long-term Debt, Type"
       }
      }
     },
     "localname": "LongtermDebtTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
      "http://www.nationalgeneral.com/role/DebtSeniorNotesDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LongtermDebtTypeDomain": {
     "auth_ref": [
      "r26",
      "r227"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of long-term debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.",
        "label": "Long-term Debt, Type [Domain]",
        "terseLabel": "Long-term Debt, Type"
       }
      }
     },
     "localname": "LongtermDebtTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
      "http://www.nationalgeneral.com/role/DebtSeniorNotesDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LossRatio": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Ratio of non-life losses and loss expenses to non-life net premiums earned.",
        "label": "Loss Ratio",
        "terseLabel": "Loss Ratio"
       }
      }
     },
     "localname": "LossRatio",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_MinorityInterest": {
     "auth_ref": [
      "r32",
      "r370",
      "r412"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 2.0,
       "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).",
        "label": "Stockholders' Equity Attributable to Noncontrolling Interest",
        "terseLabel": "Noncontrolling interest"
       }
      }
     },
     "localname": "MinorityInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails": {
       "order": 5.0,
       "parentTag": "nghc_AvailableforsaleSecuritiesDebtSecuritiesIncludingSecuritiesPledged",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale.",
        "label": "Mortgage-backed Securities Available-for-sale, Fair Value Disclosure",
        "terseLabel": "Mortgage-backed securities"
       }
      }
     },
     "localname": "MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]",
        "terseLabel": "Movement Analysis of Deferred Policy Acquisition Costs"
       }
      }
     },
     "localname": "MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivities": {
     "auth_ref": [
      "r80"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 1.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.",
        "label": "Net Cash Provided by (Used in) Financing Activities",
        "totalLabel": "Net cash used in financing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInFinancingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided by (Used in) Financing Activities [Abstract]",
        "terseLabel": "Cash flows from financing activities:"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInFinancingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivities": {
     "auth_ref": [
      "r80"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 2.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.",
        "label": "Net Cash Provided by (Used in) Investing Activities",
        "totalLabel": "Net cash used in investing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInInvestingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided by (Used in) Investing Activities [Abstract]",
        "terseLabel": "Cash flows from investing activities:"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInInvestingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivities": {
     "auth_ref": [
      "r80",
      "r82",
      "r85"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 3.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.",
        "label": "Net Cash Provided by (Used in) Operating Activities",
        "totalLabel": "Net cash provided by operating activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided by (Used in) Operating Activities [Abstract]",
        "terseLabel": "Cash flows from operating activities:"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetIncomeLoss": {
     "auth_ref": [
      "r46",
      "r49",
      "r57",
      "r85",
      "r116",
      "r382",
      "r427"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 1.0,
       "parentTag": "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.",
        "label": "Net Income (Loss) Attributable to Parent",
        "terseLabel": "Net income attributable to NGHC",
        "totalLabel": "Net income attributable to NGHC"
       }
      }
     },
     "localname": "NetIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetIncomeLossAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r46",
      "r49",
      "r294",
      "r300"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 2.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": -1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of Net Income (Loss) attributable to noncontrolling interest.",
        "label": "Net Income (Loss) Attributable to Noncontrolling Interest",
        "negatedTerseLabel": "Net (income) loss attributable to noncontrolling interest"
       }
      }
     },
     "localname": "NetIncomeLossAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic": {
     "auth_ref": [
      "r102",
      "r106"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.",
        "label": "Net Income (Loss) Available to Common Stockholders, Basic",
        "terseLabel": "Numerator for basic EPS",
        "totalLabel": "Net income attributable to NGHC common stockholders"
       }
      }
     },
     "localname": "NetIncomeLossAvailableToCommonStockholdersBasic",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted": {
     "auth_ref": [
      "r106",
      "r107"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.",
        "label": "Net Income (Loss) Available to Common Stockholders, Diluted",
        "totalLabel": "Numerator for diluted EPS - after assumed conversions"
       }
      }
     },
     "localname": "NetIncomeLossAvailableToCommonStockholdersDiluted",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetInvestmentIncome": {
     "auth_ref": [
      "r429"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 4.0,
       "parentTag": "us-gaap_Revenues",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.",
        "label": "Net Investment Income",
        "terseLabel": "Net investment income",
        "totalLabel": "Net investment income"
       }
      }
     },
     "localname": "NetInvestmentIncome",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock": {
     "auth_ref": [
      "r104"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.",
        "label": "New Accounting Pronouncements and Changes in Accounting Principles [Text Block]",
        "terseLabel": "Recent Accounting Pronouncements"
       }
      }
     },
     "localname": "NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RecentAccountingPronouncements"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "New Accounting Pronouncements or Change in Accounting Principle [Line Items]",
        "verboseLabel": "New Accounting Pronouncements or Change in Accounting Principle"
       }
      }
     },
     "localname": "NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesPremiumsandOtherreceivablesChangesInAllowanceforExpectedCreditLossesDetails",
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesReinsuranceRecoverableChangesInAllowanceforExpectedCreditLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable": {
     "auth_ref": [
      "r101",
      "r103"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Summarization of the changes in an accounting principle or a new accounting pronouncement, including the line items affected by the change and the financial effects of the change on those particular line items.",
        "label": "New Accounting Pronouncements or Change in Accounting Principle [Table]",
        "verboseLabel": "New Accounting Pronouncements or Change in Accounting Principle"
       }
      }
     },
     "localname": "NewAccountingPronouncementsOrChangeInAccountingPrincipleTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesPremiumsandOtherreceivablesChangesInAllowanceforExpectedCreditLossesDetails",
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesReinsuranceRecoverableChangesInAllowanceforExpectedCreditLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.",
        "label": "New Accounting Pronouncements, Policy [Policy Text Block]",
        "terseLabel": "Recent Accounting Pronouncements"
       }
      }
     },
     "localname": "NewAccountingPronouncementsPolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RecentAccountingPronouncementsPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_NoncontrollingInterestMember": {
     "auth_ref": [
      "r289"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This element represents that portion of equity (net assets) in a subsidiary not attributable, directly or indirectly, to the parent. A noncontrolling interest is sometimes called a minority interest.",
        "label": "Noncontrolling Interest [Member]",
        "terseLabel": "Non-controlling Interest"
       }
      }
     },
     "localname": "NoncontrollingInterestMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NonredeemableConvertiblePreferredStockMember": {
     "auth_ref": [
      "r27"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Capital stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity and may be exchanged into common shares or other types of securities at the owner's option as long as it is in accordance with the issuer's terms. This security does not have redemption requirements.",
        "label": "Nonredeemable Convertible Preferred Stock [Member]",
        "terseLabel": "Preferred stock dividends - convertible"
       }
      }
     },
     "localname": "NonredeemableConvertiblePreferredStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NonredeemablePreferredStockMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Preferred shares that are not redeemable before liquidation of the entity. Preferred shares may provide a preferential dividend to the dividend on common stock and may take precedence over common stock in the event of a liquidation. Preferred shares typically represent an ownership interest in the company.",
        "label": "Nonredeemable Preferred Stock [Member]",
        "terseLabel": "Preferred stock dividends - nonconvertible"
       }
      }
     },
     "localname": "NonredeemablePreferredStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NotesPayable": {
     "auth_ref": [
      "r10",
      "r369",
      "r409"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.",
        "label": "Notes Payable",
        "terseLabel": "Notes Payable"
       }
      }
     },
     "localname": "NotesPayable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NotesReceivableMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) within one year of the balance sheet date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.",
        "label": "Notes Receivable [Member]",
        "terseLabel": "Notes receivable"
       }
      }
     },
     "localname": "NotesReceivableMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NotesReceivableRelatedParties": {
     "auth_ref": [
      "r99",
      "r338",
      "r422"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.",
        "label": "Notes Receivable, Related Parties",
        "terseLabel": "Notes Receivable, Related Parties"
       }
      }
     },
     "localname": "NotesReceivableRelatedParties",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NumberOfOperatingSegments": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.",
        "label": "Number of Operating Segments",
        "terseLabel": "Number of business segments"
       }
      }
     },
     "localname": "NumberOfOperatingSegments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "integerItemType"
    },
    "us-gaap_OperatingExpenses": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.",
        "label": "Operating Expenses",
        "totalLabel": "Total underwriting expenses"
       }
      }
     },
     "localname": "OperatingExpenses",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Organization, Consolidation and Presentation of Financial Statements [Abstract]",
        "terseLabel": "Organization, Consolidation and Presentation of Financial Statements [Abstract]"
       }
      }
     },
     "localname": "OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock": {
     "auth_ref": [
      "r1",
      "r302"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.",
        "label": "Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]",
        "terseLabel": "Basis of Reporting"
       }
      }
     },
     "localname": "OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/BasisofReporting"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OtherAssets": {
     "auth_ref": [
      "r6",
      "r365",
      "r405"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails": {
       "order": 6.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of assets classified as other.",
        "label": "Other Assets",
        "terseLabel": "Corporate and other assets"
       }
      }
     },
     "localname": "OtherAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax": {
     "auth_ref": [
      "r35",
      "r39",
      "r322",
      "r323",
      "r327",
      "r328"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.",
        "label": "Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax",
        "totalLabel": "Total foreign currency translation adjustment, net of tax"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax": {
     "auth_ref": [
      "r34",
      "r39",
      "r320",
      "r322",
      "r324"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": 1.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.",
        "label": "Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax",
        "terseLabel": "Foreign currency translation adjustment"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax": {
     "auth_ref": [
      "r34",
      "r40",
      "r326"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": 2.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of tax expense (benefit), before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.",
        "label": "Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax",
        "negatedTerseLabel": "Income tax effect"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax": {
     "auth_ref": [
      "r36",
      "r37",
      "r39"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.",
        "label": "Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax",
        "terseLabel": "Change in unrealized gain (loss) on investments, net of tax"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossBeforeTax": {
     "auth_ref": [
      "r174"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": 1.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax, after reclassification adjustments of other comprehensive income (loss).",
        "label": "Other Comprehensive Income (Loss), before Tax",
        "terseLabel": "Other comprehensive income (loss) before income tax effect"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax": {
     "auth_ref": [
      "r34",
      "r325"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.",
        "label": "Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax",
        "verboseLabel": "Foreign currency translation adjustment, net of tax"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTax": {
     "auth_ref": [
      "r47",
      "r50",
      "r52",
      "r236"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": 2.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax and reclassification adjustments of other comprehensive income (loss).",
        "label": "Other Comprehensive Income (Loss), Net of Tax",
        "totalLabel": "Other comprehensive income (loss), net of tax"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Other Comprehensive Income (Loss), Net of Tax [Abstract]",
        "terseLabel": "Other comprehensive income:"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r47",
      "r50",
      "r291",
      "r292",
      "r296"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": 2.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests.",
        "label": "Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest",
        "negatedTerseLabel": "Comprehensive income (loss) attributable to noncontrolling interest"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax": {
     "auth_ref": [
      "r39",
      "r43",
      "r44",
      "r169"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": 1.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.",
        "label": "Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax",
        "terseLabel": "Net realized gain on investments"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax": {
     "auth_ref": [
      "r39",
      "r43",
      "r44",
      "r169"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.",
        "label": "Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax",
        "totalLabel": "Total gain on investments reclassifications to net income, net of tax"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax": {
     "auth_ref": [
      "r40",
      "r169"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": 2.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.",
        "label": "Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax",
        "negatedTerseLabel": "Income tax effect"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossTax": {
     "auth_ref": [
      "r40",
      "r285",
      "r287"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": 2.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of tax expense (benefit) allocated to other comprehensive income (loss).",
        "label": "Other Comprehensive Income (Loss), Tax",
        "negatedTerseLabel": "Income tax effect"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax": {
     "auth_ref": [
      "r36",
      "r39",
      "r169"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": 1.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.",
        "label": "Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax",
        "terseLabel": "Gross unrealized gain on investments before reclassifications"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax": {
     "auth_ref": [
      "r36",
      "r39"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.",
        "label": "Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax",
        "totalLabel": "Total change in net unrealized gain on investments, net of tax"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax": {
     "auth_ref": [
      "r37",
      "r40"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": 2.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.",
        "label": "Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax",
        "negatedTerseLabel": "Income tax effect"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherDebtSecuritiesMember": {
     "auth_ref": [
      "r163",
      "r202",
      "r250",
      "r314"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investments in debt securities classified as other.",
        "label": "Other Debt Obligations [Member]",
        "terseLabel": "Other"
       }
      }
     },
     "localname": "OtherDebtSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherInvestments": {
     "auth_ref": [
      "r22",
      "r417"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 3.0,
       "parentTag": "us-gaap_Investments",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investments classified as other.",
        "label": "Other Investments",
        "terseLabel": "Other investments (related parties - $231,593 and $238,841)",
        "verboseLabel": "Other investments"
       }
      }
     },
     "localname": "OtherInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherInvestmentsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing other investments.",
        "label": "Other Investments [Member]",
        "verboseLabel": "Other investments"
       }
      }
     },
     "localname": "OtherInvestmentsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherLiabilities": {
     "auth_ref": [
      "r378"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 6.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liabilities classified as other.",
        "label": "Other Liabilities",
        "terseLabel": "Other liabilities (Exchanges - $44,004 and $30,803)",
        "verboseLabel": "Other liabilities"
       }
      }
     },
     "localname": "OtherLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherOperatingActivitiesCashFlowStatement": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 6.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example,  cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).",
        "label": "Other Operating Activities, Cash Flow Statement",
        "terseLabel": "Other, net"
       }
      }
     },
     "localname": "OtherOperatingActivitiesCashFlowStatement",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsForLossesAndLossAdjustmentExpense": {
     "auth_ref": [
      "r81",
      "r454"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process.",
        "label": "Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid",
        "negatedTotalLabel": "Total paid"
       }
      }
     },
     "localname": "PaymentsForLossesAndLossAdjustmentExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsForProceedsFromOtherInvestingActivities": {
     "auth_ref": [
      "r69",
      "r73",
      "r100"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 9.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash (inflow) outflow from investing activities classified as other.",
        "label": "Payments for (Proceeds from) Other Investing Activities",
        "negatedTerseLabel": "Other investing activities"
       }
      }
     },
     "localname": "PaymentsForProceedsFromOtherInvestingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsForRepurchaseOfCommonStock": {
     "auth_ref": [
      "r76"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 6.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow to reacquire common stock during the period.",
        "label": "Payments for Repurchase of Common Stock",
        "negatedTerseLabel": "Common stock repurchased"
       }
      }
     },
     "localname": "PaymentsForRepurchaseOfCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsOfDividendsCommonStock": {
     "auth_ref": [
      "r76"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 2.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.",
        "label": "Payments of Ordinary Dividends, Common Stock",
        "negatedTerseLabel": "Dividends paid to common shareholders"
       }
      }
     },
     "localname": "PaymentsOfDividendsCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock": {
     "auth_ref": [
      "r76"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 3.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.",
        "label": "Payments of Ordinary Dividends, Preferred Stock and Preference Stock",
        "negatedTerseLabel": "Dividends paid to preferred shareholders"
       }
      }
     },
     "localname": "PaymentsOfDividendsPreferredStockAndPreferenceStock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation": {
     "auth_ref": [
      "r76"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 4.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.",
        "label": "Payment, Tax Withholding, Share-based Payment Arrangement",
        "negatedTerseLabel": "Taxes paid related to net share settlement of equity awards"
       }
      }
     },
     "localname": "PaymentsRelatedToTaxWithholdingForShareBasedCompensation",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt": {
     "auth_ref": [
      "r67",
      "r70",
      "r147"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 1.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Payments to Acquire Debt Securities, Available-for-sale",
        "negatedTerseLabel": "Purchases of debt securities, available-for-sale"
       }
      }
     },
     "localname": "PaymentsToAcquireAvailableForSaleSecuritiesDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireEquityMethodInvestments": {
     "auth_ref": [
      "r71"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.",
        "label": "Payments to Acquire Equity Method Investments",
        "terseLabel": "Payments to Acquire Equity Method Investments"
       }
      }
     },
     "localname": "PaymentsToAcquireEquityMethodInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireOtherInvestments": {
     "auth_ref": [
      "r73"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 3.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow to acquire investments classified as other.",
        "label": "Payments to Acquire Other Investments",
        "negatedTerseLabel": "Purchases of other investments"
       }
      }
     },
     "localname": "PaymentsToAcquireOtherInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment": {
     "auth_ref": [
      "r72"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 4.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.",
        "label": "Payments to Acquire Property, Plant, and Equipment",
        "negatedTerseLabel": "Purchases of property and equipment"
       }
      }
     },
     "localname": "PaymentsToAcquirePropertyPlantAndEquipment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquireShortTermInvestments": {
     "auth_ref": [
      "r73"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 2.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.",
        "label": "Payments to Acquire Short-term Investments",
        "negatedTerseLabel": "Purchases of short-term investments"
       }
      }
     },
     "localname": "PaymentsToAcquireShortTermInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PolicyholderBenefitsAndClaimsIncurredNet": {
     "auth_ref": [
      "r397",
      "r434"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 1.0,
       "parentTag": "us-gaap_BenefitsLossesAndExpenses",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_OperatingExpenses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.",
        "label": "Policyholder Benefits and Claims Incurred, Net",
        "terseLabel": "Loss and loss adjustment expense"
       }
      }
     },
     "localname": "PolicyholderBenefitsAndClaimsIncurredNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PreferredStockDividendPaymentRateVariable": {
     "auth_ref": [
      "r12",
      "r13",
      "r237"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Description of basis of dividend, such as adjustable rate. Excludes percentage rate dividend payments or fixed dollar amounts per share.",
        "label": "Preferred Stock, Dividend Payment Rate, Variable",
        "terseLabel": "Dividend rate per year"
       }
      }
     },
     "localname": "PreferredStockDividendPaymentRateVariable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PreferredStockDividendRatePercentage": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The percentage rate used to calculate dividend payments on preferred stock.",
        "label": "Preferred Stock, Dividend Rate, Percentage",
        "terseLabel": "Dividend rate per year"
       }
      }
     },
     "localname": "PreferredStockDividendRatePercentage",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_PreferredStockDividendsIncomeStatementImpact": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 2.0,
       "parentTag": "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.",
        "label": "Preferred Stock Dividends, Income Statement Impact",
        "negatedTerseLabel": "Dividends on preferred stock"
       }
      }
     },
     "localname": "PreferredStockDividendsIncomeStatementImpact",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PreferredStockDividendsPerShareCashPaid": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate dividends paid during the period for each share of preferred stock outstanding.",
        "label": "Preferred Stock, Dividends, Per Share, Cash Paid",
        "terseLabel": "Preferred Stock, Dividend Per Share"
       }
      }
     },
     "localname": "PreferredStockDividendsPerShareCashPaid",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityCommonandPreferredStockDividendsDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_PreferredStockLiquidationPreference": {
     "auth_ref": [
      "r13",
      "r90",
      "r95",
      "r237",
      "r238"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.",
        "label": "Preferred Stock, Liquidation Preference Per Share",
        "terseLabel": "Liquidation preference per share"
       }
      }
     },
     "localname": "PreferredStockLiquidationPreference",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_PreferredStockLiquidationPreferenceValue": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Value of the difference between preference in liquidation and the par or stated values of the preferred shares.",
        "label": "Preferred Stock, Liquidation Preference, Value",
        "terseLabel": "Aggregate liquidation preference"
       }
      }
     },
     "localname": "PreferredStockLiquidationPreferenceValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PreferredStockMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Preferred shares may provide a preferential dividend to the dividend on common stock and may take precedence over common stock in the event of a liquidation. Preferred shares typically represent an ownership interest in the company.",
        "label": "Preferred Stock [Member]",
        "terseLabel": "Preferred stock"
       }
      }
     },
     "localname": "PreferredStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PreferredStockParOrStatedValuePerShare": {
     "auth_ref": [
      "r13"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.",
        "label": "Preferred Stock, Par or Stated Value Per Share",
        "terseLabel": "Preferred stock, par value (in dollars per share)"
       }
      }
     },
     "localname": "PreferredStockParOrStatedValuePerShare",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_PreferredStockSharesAuthorized": {
     "auth_ref": [
      "r13"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.",
        "label": "Preferred Stock, Shares Authorized",
        "terseLabel": "Preferred stock, shares authorized (in shares)"
       }
      }
     },
     "localname": "PreferredStockSharesAuthorized",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_PreferredStockSharesIssued": {
     "auth_ref": [
      "r13"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.",
        "label": "Preferred Stock, Shares Issued",
        "terseLabel": "Preferred Stock, Shares Issued (in shares)"
       }
      }
     },
     "localname": "PreferredStockSharesIssued",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_PreferredStockSharesOutstanding": {
     "auth_ref": [
      "r13"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.",
        "label": "Preferred Stock, Shares Outstanding",
        "terseLabel": "Preferred stock, shares outstanding (in shares)"
       }
      }
     },
     "localname": "PreferredStockSharesOutstanding",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_PreferredStockValue": {
     "auth_ref": [
      "r13"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 1.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.",
        "label": "Preferred Stock, Value, Issued",
        "terseLabel": "Preferred stock, $0.01 par value - authorized 10,000,000 shares, issued and outstanding 2,565,120 shares - 2020 and 2019; Aggregate liquidation preference $450,000 - 2020 and 2019"
       }
      }
     },
     "localname": "PreferredStockValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PremiumReceivableAllowanceForCreditLossTableTextBlock": {
     "auth_ref": [
      "r193"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of allowance for credit loss on premium receivable.",
        "label": "Premium Receivable, Allowance for Credit Loss [Table Text Block]",
        "terseLabel": "Premium Receivable, Allowance for Credit Loss"
       }
      }
     },
     "localname": "PremiumReceivableAllowanceForCreditLossTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PremiumReceivableCreditLossExpenseReversal": {
     "auth_ref": [
      "r190"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense (reversal of expense) for expected credit loss on premium receivable.",
        "label": "Premium Receivable, Credit Loss Expense (Reversal)",
        "terseLabel": "Current period change for expected credit losses"
       }
      }
     },
     "localname": "PremiumReceivableCreditLossExpenseReversal",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesPremiumsandOtherreceivablesChangesInAllowanceforExpectedCreditLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PremiumsAndOtherReceivablesNet": {
     "auth_ref": [
      "r423"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 5.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of all premiums and other types of receivables due from other persons or entities.",
        "label": "Premiums and Other Receivables, Net",
        "terseLabel": "Premiums and other receivables (net of allowance for expected credit losses $37,163 - 2020; net of bad debt allowance $24,067 - 2019) (Exchanges - $70,076 and $55,859; net of allowance for expected credit losses $844 - 2020; net of bad debt allowance $541 - 2019)",
        "verboseLabel": "Premiums and other receivables, net"
       }
      }
     },
     "localname": "PremiumsAndOtherReceivablesNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesPremiumsandOtherreceivablesChangesInAllowanceforExpectedCreditLossesDetails",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PremiumsEarnedNet": {
     "auth_ref": [
      "r379",
      "r425",
      "r439",
      "r472"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 1.0,
       "parentTag": "us-gaap_Revenues",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 1.0,
       "parentTag": "nghc_UnderwritingRevenue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.",
        "label": "Premiums Earned, Net",
        "terseLabel": "Net earned premium",
        "totalLabel": "Net earned premium",
        "verboseLabel": "Net earned premium"
       }
      }
     },
     "localname": "PremiumsEarnedNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome",
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts": {
     "auth_ref": [
      "r139",
      "r142",
      "r189",
      "r192",
      "r403"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value.",
        "label": "Premium Receivable, Allowance for Credit Loss",
        "periodEndLabel": "Balance, end of the period",
        "periodStartLabel": "Balance, beginning of the period",
        "terseLabel": "Premiums and other receivables, allowance for expected credit losses"
       }
      }
     },
     "localname": "PremiumsReceivableAllowanceForDoubtfulAccounts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesPremiumsandOtherreceivablesChangesInAllowanceforExpectedCreditLossesDetails",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PremiumsReceivableAllowanceForDoubtfulAccountsRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Premium Receivable, Allowance for Credit Loss [Roll Forward]",
        "terseLabel": "Premium Receivable, Allowance for Credit Loss"
       }
      }
     },
     "localname": "PremiumsReceivableAllowanceForDoubtfulAccountsRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesPremiumsandOtherreceivablesChangesInAllowanceforExpectedCreditLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance": {
     "auth_ref": [
      "r140",
      "r191"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of writeoff of premium receivable, charged against allowance for credit loss.",
        "label": "Premium Receivable, Allowance for Credit Loss, Writeoff",
        "negatedLabel": "Write-offs of uncollectible premiums and other receivables"
       }
      }
     },
     "localname": "PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesPremiumsandOtherreceivablesChangesInAllowanceforExpectedCreditLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PremiumsWrittenGross": {
     "auth_ref": [
      "r473"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_PremiumsWrittenNet",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of direct and assumed premiums written.",
        "label": "Premiums Written, Gross",
        "terseLabel": "Gross premium written",
        "totalLabel": "Gross premium written"
       }
      }
     },
     "localname": "PremiumsWrittenGross",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PremiumsWrittenNet": {
     "auth_ref": [
      "r467",
      "r470"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_PremiumsEarnedNet",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written.",
        "label": "Premiums Written, Net",
        "terseLabel": "Net premium written",
        "totalLabel": "Net premium written"
       }
      }
     },
     "localname": "PremiumsWrittenNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PremiumsWrittenNetConsolidatedAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Premiums Written, Net [Abstract]",
        "terseLabel": "Premiums:"
       }
      }
     },
     "localname": "PremiumsWrittenNetConsolidatedAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PrepaidExpenseAndOtherAssets": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 12.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails": {
       "order": 5.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets.",
        "label": "Prepaid Expense and Other Assets",
        "terseLabel": "Prepaid and other assets (Exchanges - $4,312 and $3,521)",
        "verboseLabel": "Prepaid and other assets"
       }
      }
     },
     "localname": "PrepaidExpenseAndOtherAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PrepaidReinsurancePremiums": {
     "auth_ref": [
      "r451",
      "r480"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 8.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The unexpired portion of premiums ceded on policies in force as of the balance sheet date.",
        "label": "Prepaid Reinsurance Premiums",
        "terseLabel": "Prepaid reinsurance premiums (Exchanges - $105,597 and $105,894)",
        "verboseLabel": "Prepaid reinsurance premiums"
       }
      }
     },
     "localname": "PrepaidReinsurancePremiums",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities": {
     "auth_ref": [
      "r67",
      "r68",
      "r147"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 6.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale",
        "terseLabel": "Proceeds from maturities of debt securities, available-for-sale"
       }
      }
     },
     "localname": "ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromPaymentsForOtherFinancingActivities": {
     "auth_ref": [
      "r75",
      "r77",
      "r100"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 7.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from financing activities classified as other.",
        "label": "Proceeds from (Payments for) Other Financing Activities",
        "terseLabel": "Other Additional Capital"
       }
      }
     },
     "localname": "ProceedsFromPaymentsForOtherFinancingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt": {
     "auth_ref": [
      "r67",
      "r68",
      "r147"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 5.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
        "label": "Proceeds from Sale of Debt Securities, Available-for-sale",
        "terseLabel": "Proceeds from sale of debt securities, available-for-sale"
       }
      }
     },
     "localname": "ProceedsFromSaleOfAvailableForSaleSecuritiesDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromSaleOfOtherInvestments": {
     "auth_ref": [
      "r69"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 8.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow from the sale of investments classified as other.",
        "label": "Proceeds from Sale of Other Investments",
        "terseLabel": "Proceeds from sale and return of other investments"
       }
      }
     },
     "localname": "ProceedsFromSaleOfOtherInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromSaleOfShortTermInvestments": {
     "auth_ref": [
      "r69"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 7.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.",
        "label": "Proceeds from Sale of Short-term Investments",
        "terseLabel": "Proceeds from sale of short-term investments"
       }
      }
     },
     "localname": "ProceedsFromSaleOfShortTermInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromStockOptionsExercised": {
     "auth_ref": [
      "r74",
      "r278"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 5.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow from exercise of option under share-based payment arrangement.",
        "label": "Proceeds from Stock Options Exercised",
        "terseLabel": "Issuance of common stock \u2014 employee share options"
       }
      }
     },
     "localname": "ProceedsFromStockOptionsExercised",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProfitLoss": {
     "auth_ref": [
      "r46",
      "r49",
      "r78",
      "r131",
      "r136",
      "r291",
      "r293",
      "r295",
      "r300",
      "r301"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 1.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome": {
       "order": 1.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": 1.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.",
        "label": "Net Income (Loss), Including Portion Attributable to Noncontrolling Interest",
        "terseLabel": "Net income",
        "totalLabel": "Net income",
        "verboseLabel": "Net income (loss)"
       }
      }
     },
     "localname": "ProfitLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofComprehensiveIncome",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember": {
     "auth_ref": [
      "r440",
      "r460"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contract providing insurance coverage against property-related loss. Includes, but is not limited to, damage, theft, or legal liability for personal injury.",
        "label": "Property, Liability and Casualty Insurance Product Line [Member]",
        "terseLabel": "Property and Casualty"
       }
      }
     },
     "localname": "PropertyLiabilityAndCasualtyInsuranceSegmentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentNet": {
     "auth_ref": [
      "r4",
      "r5",
      "r217",
      "r416"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 9.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
        "label": "Property, Plant and Equipment, Net",
        "terseLabel": "Property and equipment, net (Exchanges - $0 and $241)",
        "verboseLabel": "Premises and equipment, net"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProvisionForDoubtfulAccounts": {
     "auth_ref": [
      "r59",
      "r190"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 3.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense (reversal of expense) for expected credit loss on accounts receivable.",
        "label": "Accounts Receivable, Credit Loss Expense (Reversal)",
        "terseLabel": "Credit loss expense"
       }
      }
     },
     "localname": "ProvisionForDoubtfulAccounts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RatioOfIndebtednessToNetCapital1": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indebtedness divided by net capital.",
        "label": "Ratio of Indebtedness to Net Capital",
        "terseLabel": "Ratio of Indebtedness to Net Capital"
       }
      }
     },
     "localname": "RatioOfIndebtednessToNetCapital1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails"
     ],
     "xbrltype": "pureItemType"
    },
    "us-gaap_ReinsuranceAccountingPolicy": {
     "auth_ref": [
      "r89",
      "r397",
      "r398",
      "r420",
      "r474",
      "r475"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of reinsurance accounting policy, for example, but not limited to, description of the methodologies and assumptions underlying determination of reinsurance recoverables, reinsurance payables and retention policy.",
        "label": "Reinsurance Accounting Policy [Policy Text Block]",
        "terseLabel": "Reinsurance Recoverable"
       }
      }
     },
     "localname": "ReinsuranceAccountingPolicy",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RecentAccountingPronouncementsPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed": {
     "auth_ref": [
      "r397"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of policy benefits and costs incurred for policies assumed.",
        "label": "Policyholder Benefits and Claims Incurred, Assumed",
        "terseLabel": "Assumed Loss and LAE"
       }
      }
     },
     "localname": "ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded": {
     "auth_ref": [
      "r397"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of reduction of provision for policy benefits and costs incurred for policies ceded.",
        "label": "Policyholder Benefits and Claims Incurred, Ceded",
        "verboseLabel": "Ceded Loss and LAE"
       }
      }
     },
     "localname": "ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReinsuranceLiabilitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Reinsurance Liabilities [Abstract]",
        "terseLabel": "Reinsurance Liabilities"
       }
      }
     },
     "localname": "ReinsuranceLiabilitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ReinsuranceLossOnUncollectibleAccountsInPeriodAmount": {
     "auth_ref": [
      "r191"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of the write-down or write-off of a receivable from a reinsurer.",
        "label": "Reinsurance, Loss on Uncollectible Accounts in Period, Amount",
        "negatedLabel": "Write-offs of uncollectible reinsurance"
       }
      }
     },
     "localname": "ReinsuranceLossOnUncollectibleAccountsInPeriodAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesReinsuranceRecoverableChangesInAllowanceforExpectedCreditLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReinsurancePayable": {
     "auth_ref": [
      "r419"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 3.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements.",
        "label": "Reinsurance Payable",
        "terseLabel": "Reinsurance payable (Exchanges - $51,711 and $35,689)",
        "verboseLabel": "Reinsurance payable"
       }
      }
     },
     "localname": "ReinsurancePayable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReinsurancePolicyDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Coverage retained or reinsured.",
        "label": "Reinsurance Policy [Domain]",
        "terseLabel": "Reinsurance Policy"
       }
      }
     },
     "localname": "ReinsurancePolicyDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ReinsurancePolicyTypeAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type, risk category or other classification of reinsurance coverage.",
        "label": "Reinsurance Policy, Type [Axis]",
        "terseLabel": "Reinsurance Policy, Type"
       }
      }
     },
     "localname": "ReinsurancePolicyTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ReinsuranceRecoverableAllowanceForCreditLossRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]",
        "terseLabel": "Reinsurance Recoverable, Allowance for Credit Loss"
       }
      }
     },
     "localname": "ReinsuranceRecoverableAllowanceForCreditLossRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesReinsuranceRecoverableChangesInAllowanceforExpectedCreditLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ReinsuranceRecoverableAllowanceForCreditLossTableTextBlock": {
     "auth_ref": [
      "r193"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of allowance for credit loss on reinsurance recoverable.",
        "label": "Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block]",
        "terseLabel": "Reinsurance Recoverable, Allowance for Credit Loss"
       }
      }
     },
     "localname": "ReinsuranceRecoverableAllowanceForCreditLossTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ReinsuranceRecoverableCreditLossExpenseReversal": {
     "auth_ref": [
      "r190"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense (reversal of expense) for expected credit loss on reinsurance recoverable.",
        "label": "Reinsurance Recoverable, Credit Loss Expense (Reversal)",
        "terseLabel": "Current period change for estimated uncollectible reinsurance"
       }
      }
     },
     "localname": "ReinsuranceRecoverableCreditLossExpenseReversal",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesReinsuranceRecoverableChangesInAllowanceforExpectedCreditLossesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments": {
     "auth_ref": [
      "r399",
      "r450",
      "r452",
      "r455"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer.",
        "label": "Reinsurance Recoverable for Unpaid Claims and Claims Adjustments",
        "negatedPeriodStartLabel": "Reinsurance Recoverable for Unpaid Claims and Claims Adjustments",
        "periodEndLabel": "Plus: Reinsurance recoverable at end of the period"
       }
      }
     },
     "localname": "ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReinsuranceRecoverablesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Reinsurance Recoverables, Including Reinsurance Premium Paid [Abstract]",
        "terseLabel": "Reinsurance Recoverables"
       }
      }
     },
     "localname": "ReinsuranceRecoverablesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ReinsuranceRecoverablesAllowance": {
     "auth_ref": [
      "r187",
      "r189",
      "r192"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": 3.0,
       "parentTag": "us-gaap_ReinsuranceRecoverablesOnPaidAndUnpaidLosses",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of allowance for credit loss on reinsurance recoverable.",
        "label": "Reinsurance Recoverable, Allowance for Credit Loss",
        "periodEndLabel": "Balance, end of the period",
        "periodStartLabel": "Balance, beginning of the period",
        "terseLabel": "Reinsurance recoverable, allowance for expected credit losses"
       }
      }
     },
     "localname": "ReinsuranceRecoverablesAllowance",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesReinsuranceRecoverableChangesInAllowanceforExpectedCreditLossesDetails",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReinsuranceRecoverablesOnPaidAndUnpaidLosses": {
     "auth_ref": [
      "r399",
      "r449",
      "r450",
      "r479"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 7.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails": {
       "order": 7.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after valuation allowance, recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts.",
        "label": "Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments",
        "terseLabel": "Reinsurance recoverable (net of allowance for expected credit losses $810 - 2020) (Exchanges - $125,095 and $119,125; net of allowance for expected credit losses $173 - 2020)",
        "totalLabel": "Reinsurance recoverable, net",
        "verboseLabel": "Reinsurance recoverable, net"
       }
      }
     },
     "localname": "ReinsuranceRecoverablesOnPaidAndUnpaidLosses",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/AllowanceforExpectedCreditLossesReinsuranceRecoverableChangesInAllowanceforExpectedCreditLossesDetails",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReinsuranceRecoverablesOnPaidLossesGross": {
     "auth_ref": [
      "r399",
      "r450"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_ReinsuranceRecoverablesOnPaidAndUnpaidLosses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before valuation allowance of reinsurance recoverables on paid losses.",
        "label": "Reinsurance Recoverables on Paid Losses, Gross",
        "terseLabel": "Reinsurance recoverable on paid losses"
       }
      }
     },
     "localname": "ReinsuranceRecoverablesOnPaidLossesGross",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReinsuranceRecoverablesOnUnpaidLossesGross": {
     "auth_ref": [
      "r399",
      "r450"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_ReinsuranceRecoverablesOnPaidAndUnpaidLosses",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before valuation allowance of reinsurance recoverables for losses reported to the ceding insurer but not yet paid, and for amounts expected based upon statistical projections and other measures of incurred losses and loss settlement expenses which have not yet been reported to the ceding insurer.",
        "label": "Reinsurance Recoverables on Unpaid Losses, Gross",
        "terseLabel": "Reinsurance recoverable on unpaid losses"
       }
      }
     },
     "localname": "ReinsuranceRecoverablesOnUnpaidLossesGross",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceEffectsofReinsuranceDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReinsuranceRetentionPolicyAmountRetained": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Stated amount that is the upper retention limit per entity policy.",
        "label": "Reinsurance Retention Policy, Amount Retained",
        "terseLabel": "Retention amount"
       }
      }
     },
     "localname": "ReinsuranceRetentionPolicyAmountRetained",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReinsuranceRetentionPolicyExcessRetentionAmountReinsured": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of risk reinsured in excess of stated retention per company policy.",
        "label": "Reinsurance Retention Policy, Excess Retention, Amount Reinsured",
        "terseLabel": "Amount of coverage in excess of retention"
       }
      }
     },
     "localname": "ReinsuranceRetentionPolicyExcessRetentionAmountReinsured",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReinsuranceRetentionPolicyLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Reinsurance Retention Policy [Line Items]",
        "terseLabel": "Reinsurance Retention Policy"
       }
      }
     },
     "localname": "ReinsuranceRetentionPolicyLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ReinsuranceRetentionPolicyTable": {
     "auth_ref": [
      "r397"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about reinsurance retention policy.",
        "label": "Reinsurance Retention Policy [Table]",
        "terseLabel": "Reinsurance Retention Policy"
       }
      }
     },
     "localname": "ReinsuranceRetentionPolicyTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ReinsuranceTextBlock": {
     "auth_ref": [
      "r482"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure pertaining to the existence, magnitude and information about insurance that has been ceded to or assumed from another insurance company, including the methodologies and assumptions used in determining recorded amounts.",
        "label": "Reinsurance [Text Block]",
        "terseLabel": "Reinsurance"
       }
      }
     },
     "localname": "ReinsuranceTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/Reinsurance"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RelatedPartyDomain": {
     "auth_ref": [
      "r344"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Related parties include affiliates; other entities for which investments are accounted for by the equity method by the entity; trusts for benefit of employees; and principal owners, management, and members of immediate families. It also may include other parties with which the entity may control or can significantly influence the management or operating policies of the other to an extent that one of the transacting parties might be prevented from fully pursuing its own separate interests.",
        "label": "Related Party [Domain]",
        "terseLabel": "Related Party"
       }
      }
     },
     "localname": "RelatedPartyDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails",
      "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsOtherRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RelatedPartyTransactionAxis": {
     "auth_ref": [
      "r252",
      "r339",
      "r340"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of related party transaction.",
        "label": "Related Party Transaction [Axis]",
        "terseLabel": "Related Party Transaction"
       }
      }
     },
     "localname": "RelatedPartyTransactionAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsOtherRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RelatedPartyTransactionDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Transaction between related party.",
        "label": "Related Party Transaction [Domain]",
        "terseLabel": "Related Party Transaction"
       }
      }
     },
     "localname": "RelatedPartyTransactionDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsOtherRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty": {
     "auth_ref": [
      "r337"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.",
        "label": "Related Party Transaction, Expenses from Transactions with Related Party",
        "verboseLabel": "Expenses from transactions with related party"
       }
      }
     },
     "localname": "RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsOtherRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RelatedPartyTransactionLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Related Party Transaction [Line Items]",
        "terseLabel": "Related Party Transaction"
       }
      }
     },
     "localname": "RelatedPartyTransactionLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsOtherRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RelatedPartyTransactionsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Related Party Transactions [Abstract]",
        "terseLabel": "Related Party Transactions [Abstract]"
       }
      }
     },
     "localname": "RelatedPartyTransactionsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_RelatedPartyTransactionsByRelatedPartyAxis": {
     "auth_ref": [
      "r252",
      "r339",
      "r340",
      "r351",
      "r352",
      "r353",
      "r354",
      "r355",
      "r356",
      "r357",
      "r358",
      "r359",
      "r360",
      "r361",
      "r362"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of related party. Related parties include, but not limited to, affiliates; other entities for which investments are accounted for by the equity method by the entity; trusts for benefit of employees; and principal owners, management, and members of immediate families. It also may include other parties with which the entity may control or can significantly influence the management or operating policies of the other to an extent that one of the transacting parties might be prevented from fully pursuing its own separate interests.",
        "label": "Related Party [Axis]",
        "terseLabel": "Related Party"
       }
      }
     },
     "localname": "RelatedPartyTransactionsByRelatedPartyAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails",
      "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsOtherRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RelatedPartyTransactionsDisclosureTextBlock": {
     "auth_ref": [
      "r344"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.",
        "label": "Related Party Transactions Disclosure [Text Block]",
        "terseLabel": "Related Party Transactions"
       }
      }
     },
     "localname": "RelatedPartyTransactionsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactions"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 1.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow for short-term and long-term debt and lease obligation.",
        "label": "Repayments of Debt and Lease Obligation",
        "negatedTerseLabel": "Repayments of debt and principal payments under capital leases obligations"
       }
      }
     },
     "localname": "RepaymentsOfDebtAndCapitalLeaseObligations",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ResidentialMortgageBackedSecuritiesMember": {
     "auth_ref": [
      "r149",
      "r250"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Securities collateralized by residential real estate mortgage loans.",
        "label": "Residential Mortgage Backed Securities [Member]",
        "terseLabel": "Residential mortgage-backed securities"
       }
      }
     },
     "localname": "ResidentialMortgageBackedSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RestrictedCashAndCashEquivalents": {
     "auth_ref": [
      "r3",
      "r86",
      "r88",
      "r364",
      "r410"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 3.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      },
      "http://www.nationalgeneral.com/role/InvestmentsCashandCashEquivalentsRestrictedCashandRestrictedInvestmentsDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Restricted Cash and Cash Equivalents",
        "terseLabel": "Restricted cash and cash equivalents (Exchanges - $325 and $24)",
        "verboseLabel": "Restricted cash and cash equivalents"
       }
      }
     },
     "localname": "RestrictedCashAndCashEquivalents",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/InvestmentsCashandCashEquivalentsRestrictedCashandRestrictedInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RestrictedCashAndInvestments": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/InvestmentsCashandCashEquivalentsRestrictedCashandRestrictedInvestmentsDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.",
        "label": "Restricted Cash and Investments",
        "totalLabel": "Total restricted investments"
       }
      }
     },
     "localname": "RestrictedCashAndInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsCashandCashEquivalentsRestrictedCashandRestrictedInvestmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RestrictedStockUnitsRSUMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met.",
        "label": "Restricted Stock Units (RSUs) [Member]",
        "terseLabel": "RSUs"
       }
      }
     },
     "localname": "RestrictedStockUnitsRSUMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RetainedEarningsAccumulatedDeficit": {
     "auth_ref": [
      "r17",
      "r243",
      "r411"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 6.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
        "label": "Retained Earnings (Accumulated Deficit)",
        "terseLabel": "Retained earnings"
       }
      }
     },
     "localname": "RetainedEarningsAccumulatedDeficit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RetainedEarningsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
        "label": "Retained Earnings [Member]",
        "terseLabel": "Retained Earnings"
       }
      }
     },
     "localname": "RetainedEarningsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax": {
     "auth_ref": [
      "r247",
      "r248"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.",
        "label": "Revenue from Contract with Customer, Including Assessed Tax",
        "terseLabel": "Service and fee income"
       }
      }
     },
     "localname": "RevenueFromContractWithCustomerIncludingAssessedTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RevenueRecognitionPremiumsEarnedPolicy": {
     "auth_ref": [
      "r89",
      "r463",
      "r464"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy for determining revenue and timing of recognition as revenue of premiums received from policyholders, insureds and other insurance entities (the effects of ceding and assuming insurance policy risks) for the entity's insurance products.",
        "label": "Revenue Recognition, Premiums Earned, Policy [Policy Text Block]",
        "terseLabel": "Premiums and Other Receivables"
       }
      }
     },
     "localname": "RevenueRecognitionPremiumsEarnedPolicy",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RecentAccountingPronouncementsPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_Revenues": {
     "auth_ref": [
      "r54",
      "r124",
      "r125",
      "r135"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).",
        "label": "Revenues",
        "totalLabel": "Total revenues"
       }
      }
     },
     "localname": "Revenues",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RevenuesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Revenues [Abstract]",
        "terseLabel": "Revenues:"
       }
      }
     },
     "localname": "RevenuesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofIncome"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Debt Securities, Available-for-sale [Line Items]",
        "terseLabel": "Schedule of Available-for-sale Securities"
       }
      }
     },
     "localname": "ScheduleOfAvailableForSaleSecuritiesLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfAvailableForSaleSecuritiesTable": {
     "auth_ref": [
      "r156",
      "r161",
      "r165",
      "r166",
      "r167",
      "r168",
      "r386",
      "r391"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.",
        "label": "Schedule of Available-for-sale Securities [Table]",
        "terseLabel": "Schedule of Available-for-sale Securities"
       }
      }
     },
     "localname": "ScheduleOfAvailableForSaleSecuritiesTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements.",
        "label": "Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]",
        "terseLabel": "Schedule of Carrying Values and Estimated Fair Values of Debt Instruments"
       }
      }
     },
     "localname": "ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfCededCreditRiskByReinsurerTextBlock": {
     "auth_ref": [
      "r481"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of reinsurer or group of reinsurers for whom the entity has a concentration of credit risk.",
        "label": "Ceded Credit Risk [Table Text Block]",
        "terseLabel": "Schedule of Effect of Reinsurance on Losses"
       }
      }
     },
     "localname": "ScheduleOfCededCreditRiskByReinsurerTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/ReinsuranceTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfCommonStockOutstandingRollForwardTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the change in common stock outstanding.",
        "label": "Schedule of Common Stock Outstanding Roll Forward [Table Text Block]",
        "terseLabel": "Schedule of Common Stock Outstanding Roll Forward"
       }
      }
     },
     "localname": "ScheduleOfCommonStockOutstandingRollForwardTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfDebtInstrumentsTextBlock": {
     "auth_ref": [
      "r26",
      "r97",
      "r237",
      "r240",
      "r241",
      "r242",
      "r330",
      "r331",
      "r333",
      "r395"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.",
        "label": "Schedule of Long-term Debt Instruments [Table Text Block]",
        "terseLabel": "Schedule of Debt Instruments"
       }
      }
     },
     "localname": "ScheduleOfDebtInstrumentsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock": {
     "auth_ref": [
      "r116"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.",
        "label": "Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]",
        "terseLabel": "Schedule of Earnings Per Share, Basic and Diluted"
       }
      }
     },
     "localname": "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable": {
     "auth_ref": [
      "r60",
      "r108",
      "r110",
      "r112",
      "r115",
      "r117"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Complete disclosure pertaining to an entity's diluted earnings per share.",
        "label": "Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table]",
        "terseLabel": "Schedule of Earnings Per Share, Diluted"
       }
      }
     },
     "localname": "ScheduleOfEarningsPerShareDilutedByCommonClassTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable": {
     "auth_ref": [
      "r137"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular presentation of the description and amount of revenues from a product or service, or a group of similar products or similar services, reported from external customers during the period, if the information is not provided as part of the reportable operating segment information.",
        "label": "Revenue from External Customers by Products and Services [Table]",
        "terseLabel": "Revenue from External Customers by Products and Services"
       }
      }
     },
     "localname": "ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock": {
     "auth_ref": [
      "r137"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information.",
        "label": "Revenue from External Customers by Products and Services [Table Text Block]",
        "terseLabel": "Revenue from External Customers by Product Type"
       }
      }
     },
     "localname": "ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEquityMethodInvestmentsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Schedule of Equity Method Investments [Line Items]",
        "terseLabel": "Schedule of Equity Method Investments"
       }
      }
     },
     "localname": "ScheduleOfEquityMethodInvestmentsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfEquityMethodInvestmentsTable": {
     "auth_ref": [
      "r176"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Summarization of information required and determined to be disclosed concerning equity method investments in common stock. The summarized information includes: (a) the name of each investee or group of investees for which combined disclosure is appropriate, (2) the percentage ownership of common stock, (3) the difference, if any, between the carrying amount of an investment and the value of the underlying equity in the net assets and the accounting treatment of difference, if any, and (4) the aggregate value of each identified investment based on its quoted market price, if available.",
        "label": "Schedule of Equity Method Investments [Table]",
        "terseLabel": "Schedule of Equity Method Investments"
       }
      }
     },
     "localname": "ScheduleOfEquityMethodInvestmentsTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Gain (Loss) on Securities [Line Items]",
        "terseLabel": "Gain (Loss) on Investments"
       }
      }
     },
     "localname": "ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfGainLossOnInvestmentsTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about realized and unrealized gain (loss) on investment in security.",
        "label": "Schedule of Gain (Loss) on Securities [Table]",
        "terseLabel": "Schedule of Gain (Loss) on Investments"
       }
      }
     },
     "localname": "ScheduleOfGainLossOnInvestmentsTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Net Investment Income [Line Items]",
        "terseLabel": "Net Investment Income"
       }
      }
     },
     "localname": "ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable": {
     "auth_ref": [
      "r62",
      "r65",
      "r66",
      "r432"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about investment income, including, but not limited to, interest and dividend income and amortization of discount (premium) derived from debt and equity securities. Excludes realized and unrealized gain (loss) on investments.",
        "label": "Investment Income [Table]",
        "terseLabel": "Investment Income"
       }
      }
     },
     "localname": "ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense": {
     "auth_ref": [
      "r456"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims.",
        "label": "Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]",
        "terseLabel": "Schedule of Liability for Unpaid Claims and Claims Adjustment Expense"
       }
      }
     },
     "localname": "ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock": {
     "auth_ref": [
      "r226"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented.",
        "label": "Schedule of Maturities of Long-term Debt [Table Text Block]",
        "terseLabel": "Schedule of Maturities of Long-term Debt"
       }
      }
     },
     "localname": "ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock": {
     "auth_ref": [
      "r101",
      "r103",
      "r119",
      "r120",
      "r121"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.",
        "label": "Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]",
        "terseLabel": "Schedule of New Accounting Pronouncements and Changes in Accounting Principles"
       }
      }
     },
     "localname": "ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RecentAccountingPronouncementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable": {
     "auth_ref": [
      "r92",
      "r339",
      "r340",
      "r341",
      "r342",
      "r343"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of quantitative and qualitative information pertaining to related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.",
        "label": "Schedule of Related Party Transactions, by Related Party [Table]",
        "terseLabel": "Schedule of Related Party Transactions, by Related Party"
       }
      }
     },
     "localname": "ScheduleOfRelatedPartyTransactionsByRelatedPartyTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsCreditAgreementwithACPReDetails",
      "http://www.nationalgeneral.com/role/RelatedPartyTransactionsOtherRelatedPartyTransactionsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock": {
     "auth_ref": [
      "r3",
      "r88",
      "r364",
      "r410"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage.",
        "label": "Restrictions on Cash and Cash Equivalents [Table Text Block]",
        "terseLabel": "Cash, Cash Equivalents, Restricted Cash and Restricted Investments"
       }
      }
     },
     "localname": "ScheduleOfRestrictedCashAndCashEquivalentsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable": {
     "auth_ref": [
      "r123",
      "r131",
      "r133",
      "r134",
      "r214"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A table disclosing the profit or loss and total assets for each reportable segment of the entity. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.",
        "label": "Schedule of Segment Reporting Information, by Segment [Table]",
        "terseLabel": "Schedule of Segment Reporting Information, by Segment"
       }
      }
     },
     "localname": "ScheduleOfSegmentReportingInformationBySegmentTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock": {
     "auth_ref": [
      "r123",
      "r131",
      "r133",
      "r134",
      "r214"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.",
        "label": "Schedule of Segment Reporting Information, by Segment [Table Text Block]",
        "terseLabel": "Schedule of Segment Reporting Information by Segment"
       }
      }
     },
     "localname": "ScheduleOfSegmentReportingInformationBySegmentTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable": {
     "auth_ref": [
      "r257",
      "r277"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about share-based payment arrangement.",
        "label": "Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]",
        "terseLabel": "Schedule of Share-based Compensation Arrangements by Share-based Payment Award"
       }
      }
     },
     "localname": "ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock": {
     "auth_ref": [
      "r261"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.",
        "label": "Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]",
        "terseLabel": "Schedule of Stock-based Compensation, Restricted Stock Units Award Activity"
       }
      }
     },
     "localname": "ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock": {
     "auth_ref": [
      "r261",
      "r270",
      "r272"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.",
        "label": "Share-based Payment Arrangement, Option, Activity [Table Text Block]",
        "terseLabel": "Schedule of Stock-based Compensation, Stock Options, Activity"
       }
      }
     },
     "localname": "ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfStockByClassTable": {
     "auth_ref": [
      "r28",
      "r96",
      "r233",
      "r234",
      "r235",
      "r237",
      "r238",
      "r239",
      "r240",
      "r241",
      "r242",
      "r243"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule detailing information related to equity by class of stock. Class of stock includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. It also includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity.",
        "label": "Schedule of Stock by Class [Table]",
        "terseLabel": "Schedule of Stock by Class"
       }
      }
     },
     "localname": "ScheduleOfStockByClassTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityCommonandPreferredStockDividendsDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquitySharesRollforwardDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SegmentDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity.",
        "label": "Segments [Domain]",
        "terseLabel": "Segments"
       }
      }
     },
     "localname": "SegmentDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SegmentReportingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Segment Reporting [Abstract]",
        "terseLabel": "Segment Reporting [Abstract]"
       }
      }
     },
     "localname": "SegmentReportingAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_SegmentReportingDisclosureTextBlock": {
     "auth_ref": [
      "r138"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.",
        "label": "Segment Reporting Disclosure [Text Block]",
        "terseLabel": "Segment Information"
       }
      }
     },
     "localname": "SegmentReportingDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformation"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SegmentReportingInformationLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Segment Reporting Information [Line Items]",
        "terseLabel": "Segment Reporting Information"
       }
      }
     },
     "localname": "SegmentReportingInformationLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SeniorNotesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Bond that takes priority over other debt securities sold by the issuer. In the event the issuer goes bankrupt, senior debt holders receive priority for (must receive) repayment prior to (relative to) junior and unsecured (general) creditors.",
        "label": "Senior Notes [Member]",
        "terseLabel": "Senior Notes"
       }
      }
     },
     "localname": "SeniorNotesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCovenantsandComplianceDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtDebtMaturitiesDetails",
      "http://www.nationalgeneral.com/role/DebtInterestExpenseDetails",
      "http://www.nationalgeneral.com/role/DebtSeniorNotesDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsDebtDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SeniorSubordinatedNotesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A senior subordinated note is a bond that takes priority over other debt securities sold by the issuer. In the event the issuer goes bankrupt, senior subordinated debt holders receive priority for [must receive] repayment [prior] relative to junior and unsecured (general) creditors. However  senior subordinated notes are junior to Senior Notes and Senior bond holders.",
        "label": "Senior Subordinated Notes [Member]",
        "terseLabel": "7.625% Subordinated Notes due 2055"
       }
      }
     },
     "localname": "SeniorSubordinatedNotesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SeriesAPreferredStockMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Outstanding nonredeemable series A preferred stock or outstanding series A preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer.",
        "label": "Series A Preferred Stock [Member]",
        "terseLabel": "7.50% Non-Cumulative Preferred Stock, Series A",
        "verboseLabel": "Preferred Stock Series A"
       }
      }
     },
     "localname": "SeriesAPreferredStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement",
      "http://www.nationalgeneral.com/role/StockholdersEquityCommonandPreferredStockDividendsDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SeriesBPreferredStockMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Outstanding nonredeemable series B preferred stock or outstanding series B preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer.",
        "label": "Series B Preferred Stock [Member]",
        "terseLabel": "Depositary Shares, Representing 1/40th of a Share of 7.50% Non-Cumulative Preferred Stock, Series B",
        "verboseLabel": "Preferred Stock Series B"
       }
      }
     },
     "localname": "SeriesBPreferredStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SeriesCPreferredStockMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Outstanding nonredeemable series C preferred stock or outstanding series C preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer.",
        "label": "Series C Preferred Stock [Member]",
        "terseLabel": "Depositary Shares, Representing 1/40th of a Share of 7.50% Non-Cumulative Preferred Stock, Series C",
        "verboseLabel": "Preferred Stock Series C"
       }
      }
     },
     "localname": "SeriesCPreferredStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SeriesDPreferredStockMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Outstanding nonredeemable series D preferred stock or outstanding series D preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer.",
        "label": "Series D Preferred Stock [Member]",
        "terseLabel": "Preferred Stock Series D"
       }
      }
     },
     "localname": "SeriesDPreferredStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityCommonandPreferredStockDividendsDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ShareBasedCompensation": {
     "auth_ref": [
      "r83"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows": {
       "order": 5.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of noncash expense for share-based payment arrangement.",
        "label": "Share-based Payment Arrangement, Noncash Expense",
        "terseLabel": "Stock-based compensation expense"
       }
      }
     },
     "localname": "ShareBasedCompensation",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue": {
     "auth_ref": [
      "r268"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value",
        "terseLabel": "Granted"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue": {
     "auth_ref": [
      "r267"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value",
        "periodEndLabel": "Non-vested at end of period",
        "periodStartLabel": "Non-vested at beginning of period"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]",
        "terseLabel": "Weighted Average Grant Date Fair Value (in usd per share)"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod": {
     "auth_ref": [
      "r269"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period",
        "negatedTerseLabel": "Vested"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue": {
     "auth_ref": [
      "r271"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value",
        "terseLabel": "Fair value of RSU's vested"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue": {
     "auth_ref": [
      "r269"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value",
        "terseLabel": "Vested"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award [Line Items]",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted": {
     "auth_ref": [
      "r265"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Net number of non-option equity instruments granted to participants.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted",
        "terseLabel": "Granted"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber": {
     "auth_ref": [
      "r262",
      "r264"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of equity instruments other than options outstanding, including both vested and non-vested instruments.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number",
        "periodEndLabel": "Non-vested at end of period",
        "periodStartLabel": "Non-vested at beginning of period"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]",
        "terseLabel": "RSUs"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized": {
     "auth_ref": [
      "r258"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of shares authorized for issuance under share-based payment arrangement.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized",
        "terseLabel": "Number of shares authorized"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant": {
     "auth_ref": [
      "r277"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant",
        "terseLabel": "Number of shares available for grant"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue": {
     "auth_ref": [
      "r271"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value",
        "terseLabel": "Intrinsic value of stock options exercised"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gross number of share options (or share units) granted during the period.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross",
        "terseLabel": "Granted in period"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue": {
     "auth_ref": [
      "r277"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value",
        "terseLabel": "Intrinsic value of the underlying stock exceeds the exercise price of options outstanding"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber": {
     "auth_ref": [
      "r263",
      "r277"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of options outstanding, including both vested and non-vested options.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number",
        "periodEndLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance",
        "periodStartLabel": "Outstanding at beginning of the period"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice": {
     "auth_ref": [
      "r262"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price",
        "periodEndLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance",
        "periodStartLabel": "Outstanding at beginning of the period"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]",
        "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod": {
     "auth_ref": [
      "r277"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of shares issued under share-based payment arrangement.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period",
        "terseLabel": "Shares issued under employee stock plans and exercises of stock options (in shares)"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquitySharesRollforwardDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain": {
     "auth_ref": [
      "r255",
      "r259"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Award under share-based payment arrangement.",
        "label": "Award Type [Domain]",
        "terseLabel": "Equity Award"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationRSUActivityDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average price at which option holders acquired shares when converting their stock options into shares.",
        "label": "Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price",
        "terseLabel": "Exercised"
       }
      }
     },
     "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_SharePrice": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Price of a single share of a number of saleable stocks of a company.",
        "label": "Share Price",
        "terseLabel": "Share Price"
       }
      }
     },
     "localname": "SharePrice",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2": {
     "auth_ref": [
      "r273"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term",
        "terseLabel": "Weighted average remaining contractual term for option awards outstanding"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1": {
     "auth_ref": [
      "r260"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value",
        "terseLabel": "Fair value of stock options vested"
       }
      }
     },
     "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.",
        "label": "Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation",
        "negatedLabel": "Shares withheld related to net share settlement (in shares)"
       }
      }
     },
     "localname": "SharesPaidForTaxWithholdingForShareBasedCompensation",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquitySharesRollforwardDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_ShortTermInvestments": {
     "auth_ref": [
      "r8",
      "r372",
      "r373",
      "r375",
      "r404"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 2.0,
       "parentTag": "us-gaap_Investments",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.",
        "label": "Short-term Investments",
        "terseLabel": "Short-term investments (Exchanges - $30,952 and $5,245)",
        "verboseLabel": "Short-term investments"
       }
      }
     },
     "localname": "ShortTermInvestments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShortTermInvestmentsMember": {
     "auth_ref": [
      "r490"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Investments which are not otherwise included in another category or item that the entity has the intent to sell or dispose of within one year from the date of the balance sheet.",
        "label": "Short-term Investments [Member]",
        "terseLabel": "Short-term investments"
       }
      }
     },
     "localname": "ShortTermInvestmentsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_StatementBusinessSegmentsAxis": {
     "auth_ref": [
      "r0",
      "r131",
      "r214",
      "r218",
      "r219",
      "r220",
      "r457"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by business segments.",
        "label": "Segments [Axis]",
        "terseLabel": "Segments"
       }
      }
     },
     "localname": "StatementBusinessSegmentsAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationLongLivedAssetsandTotalAssetsofBusinessSegmentsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementClassOfStockAxis": {
     "auth_ref": [
      "r12",
      "r13",
      "r14",
      "r236"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by the different classes of stock of the entity.",
        "label": "Class of Stock [Axis]",
        "terseLabel": "Class of Stock"
       }
      }
     },
     "localname": "StatementClassOfStockAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DocumentandEntityInformationStatement",
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails",
      "http://www.nationalgeneral.com/role/StockBasedCompensationNarrativeDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquityCommonandPreferredStockDividendsDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquitySharesRollforwardDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementEquityComponentsAxis": {
     "auth_ref": [
      "r30",
      "r236"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by component of equity.",
        "label": "Equity Components [Axis]",
        "terseLabel": "Equity Components"
       }
      }
     },
     "localname": "StatementEquityComponentsAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity",
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Statement [Line Items]",
        "terseLabel": "Statement"
       }
      }
     },
     "localname": "StatementLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfCashFlowsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Cash Flows [Abstract]",
        "terseLabel": "Statement of Cash Flows [Abstract]"
       }
      }
     },
     "localname": "StatementOfCashFlowsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfFinancialPositionAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Financial Position [Abstract]",
        "terseLabel": "Statement of Financial Position [Abstract]"
       }
      }
     },
     "localname": "StatementOfFinancialPositionAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Comprehensive Income [Abstract]",
        "terseLabel": "Statement of Comprehensive Income [Abstract]"
       }
      }
     },
     "localname": "StatementOfIncomeAndComprehensiveIncomeAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfStockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement of Stockholders' Equity [Abstract]",
        "terseLabel": "Statement of Stockholders' Equity [Abstract]"
       }
      }
     },
     "localname": "StatementOfStockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule reflecting a Statement of Income, Statement of Cash Flows, Statement of Financial Position, Statement of Shareholders' Equity and Other Comprehensive Income, or other statement as needed.",
        "label": "Statement [Table]",
        "terseLabel": "Statement"
       }
      }
     },
     "localname": "StatementTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised": {
     "auth_ref": [
      "r13",
      "r14",
      "r236",
      "r243",
      "r266"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of share options (or share units) exercised during the current period.",
        "label": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period",
        "negatedTerseLabel": "Exercised"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodSharesStockOptionsExercised",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockBasedCompensationStockOptionActivityDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_StockIssuedDuringPeriodValueOther": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Value of shares of stock issued attributable to transactions classified as other.",
        "label": "Stock Issued During Period, Value, Other",
        "terseLabel": "Common stock issued under employee stock plans and exercises of stock options, value"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodValueOther",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockRepurchaseProgramAuthorizedAmount1": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of stock repurchase plan authorized.",
        "label": "Stock Repurchase Program, Authorized Amount",
        "terseLabel": "Stock repurchase program, authorized amount"
       }
      }
     },
     "localname": "StockRepurchaseProgramAuthorizedAmount1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityShareRepurchaseProgramDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockholdersEquity": {
     "auth_ref": [
      "r14",
      "r18",
      "r19",
      "r143"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 1.0,
       "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.",
        "label": "Stockholders' Equity Attributable to Parent",
        "totalLabel": "Total National General Holdings Corp. stockholders\u2019 equity"
       }
      }
     },
     "localname": "StockholdersEquity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r289",
      "r290",
      "r299"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 1.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.",
        "label": "Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest",
        "periodEndLabel": "Total stockholders' equity, amount, ending balance",
        "periodStartLabel": "Total stockholders' equity, amount, beginning balance",
        "totalLabel": "Total stockholders\u2019 equity"
       }
      }
     },
     "localname": "StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]",
        "terseLabel": "Stockholders\u2019 equity:"
       }
      }
     },
     "localname": "StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StockholdersEquityNoteDisclosureTextBlock": {
     "auth_ref": [
      "r246"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.",
        "label": "Stockholders' Equity Note Disclosure [Text Block]",
        "terseLabel": "Stockholders' Equity"
       }
      }
     },
     "localname": "StockholdersEquityNoteDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquity"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SubsequentEventMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Identifies event that occurred after the balance sheet date but before financial statements are issued or available to be issued.",
        "label": "Subsequent Event [Member]",
        "terseLabel": "Subsequent Event"
       }
      }
     },
     "localname": "SubsequentEventMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SubsequentEventTypeAxis": {
     "auth_ref": [
      "r345"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by event that occurred after the balance sheet date but before financial statements are issued or available to be issued.",
        "label": "Subsequent Event Type [Axis]",
        "terseLabel": "Subsequent Event Type"
       }
      }
     },
     "localname": "SubsequentEventTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SubsequentEventTypeDomain": {
     "auth_ref": [
      "r345"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Event that occurred after the balance sheet date but before financial statements are issued or available to be issued.",
        "label": "Subsequent Event Type [Domain]",
        "terseLabel": "Subsequent Event Type"
       }
      }
     },
     "localname": "SubsequentEventTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityPreferredStockDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SummaryOfInvestmentHoldingsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Summary of Investment Holdings [Line Items]",
        "terseLabel": "Summary of Investment Holdings"
       }
      }
     },
     "localname": "SummaryOfInvestmentHoldingsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsShorttermandOtherInvestmentsDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SupplementalCashFlowElementsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Supplemental Cash Flow Elements [Abstract]",
        "terseLabel": "Supplemental Cash Flow Elements:"
       }
      }
     },
     "localname": "SupplementalCashFlowElementsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofCashFlows"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense": {
     "auth_ref": [
      "r453"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs.",
        "label": "Current Year Claims and Claims Adjustment Expense",
        "terseLabel": "Current year"
       }
      }
     },
     "localname": "SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense": {
     "auth_ref": [
      "r453"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.",
        "label": "Prior Year Claims and Claims Adjustment Expense",
        "terseLabel": "Prior year"
       }
      }
     },
     "localname": "SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain": {
     "auth_ref": [
      "r350"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Instrument or contract that imposes a contractual obligation to deliver cash or another financial instrument or to exchange other financial instruments on potentially unfavorable terms and conveys a contractual right to receive cash or another financial instrument or to exchange other financial instruments on potentially favorable terms.",
        "label": "Financial Instruments [Domain]",
        "terseLabel": "Financial Instrument"
       }
      }
     },
     "localname": "TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAllowanceForCreditLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TreasuryStockCommonShares": {
     "auth_ref": [
      "r31",
      "r244"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of previously issued common shares repurchased by the issuing entity and held in treasury.",
        "label": "Treasury Stock, Common, Shares",
        "negatedPeriodEndLabel": "Treasury Stock, at end of the period (in shares)",
        "negatedPeriodStartLabel": "Treasury Stock, beginning of the period (in shares)",
        "terseLabel": "Treasury Stock, Common, Shares"
       }
      }
     },
     "localname": "TreasuryStockCommonShares",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/StockholdersEquitySharesRollforwardDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_TreasuryStockCommonValue": {
     "auth_ref": [
      "r31",
      "r244",
      "r245"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 3.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount allocated to previously issued common shares repurchased by the issuing entity and held in treasury.",
        "label": "Treasury Stock, Common, Value",
        "negatedLabel": "Treasury stock, at cost - 459,083 shares - 2020"
       }
      }
     },
     "localname": "TreasuryStockCommonValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TreasuryStockMember": {
     "auth_ref": [
      "r29",
      "r244"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Shares of an entity that have been repurchased by the entity. This stock has no voting rights and receives no dividends. Note that treasury stock may be recorded at its total cost or separately as par (or stated) value and additional paid in capital. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer.",
        "label": "Treasury Stock [Member]",
        "terseLabel": "Treasury Stock"
       }
      }
     },
     "localname": "TreasuryStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TreasuryStockSharesAcquired": {
     "auth_ref": [
      "r14",
      "r236",
      "r243"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of shares that have been repurchased during the period and are being held in treasury.",
        "label": "Treasury Stock, Shares, Acquired",
        "negatedTerseLabel": "Treasury Stock, Shares, Acquired",
        "terseLabel": "Treasury Stock, Shares, Acquired"
       }
      }
     },
     "localname": "TreasuryStockSharesAcquired",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/StockholdersEquityShareRepurchaseProgramDetails",
      "http://www.nationalgeneral.com/role/StockholdersEquitySharesRollforwardDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_TreasuryStockValueAcquiredCostMethod": {
     "auth_ref": [
      "r236",
      "r243",
      "r244"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.",
        "label": "Treasury Stock, Value, Acquired, Cost Method",
        "negatedTerseLabel": "Common stock repurchased",
        "terseLabel": "Treasury Stock, Value, Acquired"
       }
      }
     },
     "localname": "TreasuryStockValueAcquiredCostMethod",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity",
      "http://www.nationalgeneral.com/role/StockholdersEquityShareRepurchaseProgramDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TypeOfAdoptionMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Adoption and early adoption of sources of change to generally accepted accounting principles (GAAP) in the United States. The FASB released the FASB Accounting Standards Codification as the authoritative source of literature effective for interim and annual periods ending after September 15, 2009. As part of the Codification process, the FASB issues Accounting Standards Updates to amend the Codification but otherwise the Accounting Standards Updates are not authoritative in their own right. All previous accounting standards (such as FASB Statements of Financial Accounting Standards, FASB Interpretations, FASB Staff Positions, Emerging Issues Task Force Consensuses, other pronouncements of the FASB or other designated bodies, or other forms of GAAP are considered accounting pronouncements) were superseded upon the adoption of the Codification. For an interim period, references to the superseded standards are included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.",
        "label": "Type of Adoption [Domain]",
        "terseLabel": "Type of Adoption"
       }
      }
     },
     "localname": "TypeOfAdoptionMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_USGovernmentAgenciesDebtSecuritiesMember": {
     "auth_ref": [
      "r250",
      "r374"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Debentures, notes, and other debt securities issued by US government agencies, for example, but not limited to, Government National Mortgage Association (GNMA or Ginnie Mae). Excludes US treasury securities and debt issued by government-sponsored Enterprises (GSEs), for example, but is not limited to, Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac), Federal National Mortgage Association (FNMA or Fannie Mae), and the Federal Home Loan Bank (FHLB).",
        "label": "US Government Agencies Debt Securities [Member]",
        "terseLabel": "Federal agencies"
       }
      }
     },
     "localname": "USGovernmentAgenciesDebtSecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_USStatesAndPoliticalSubdivisionsMember": {
     "auth_ref": [
      "r250",
      "r476"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Bonds or similar securities issued by state, city, or local US governments or the agencies operated by state, city, or local governments. Debt securities issued by state governments may include bond issuances of US state authorities including, for example, but not limited to, housing authorities, dormitory authorities, and general obligations while debt securities issued by political subdivisions of US states would include, for example, debt issuances by county, borough, city, or municipal governments.",
        "label": "US States and Political Subdivisions Debt Securities [Member]",
        "terseLabel": "States and political subdivision bonds"
       }
      }
     },
     "localname": "USStatesAndPoliticalSubdivisionsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsChangesinFairValueofLevel3FinancialAssetsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_USTreasurySecuritiesMember": {
     "auth_ref": [
      "r250",
      "r253",
      "r374"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This category includes information about debt securities issued by the United States Department of the Treasury and backed by the United States government. Such securities primarily consist of treasury bills (short-term maturities - one year or less), treasury notes (intermediate term maturities - two to ten years), and treasury bonds (long-term maturities - ten to thirty years).",
        "label": "US Treasury Securities [Member]",
        "terseLabel": "U.S. Treasury"
       }
      }
     },
     "localname": "USTreasurySecuritiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_UnderwritingIncomeLoss": {
     "auth_ref": [],
     "calculation": {
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The difference between the price paid by the public and the contract price less the related expenses. A broker-dealer may underwrite a security offering by contracting to buy the issue either at a fixed price or a price based on selling the offering on a best-effort basis.",
        "label": "Underwriting Income (Loss)",
        "terseLabel": "Underwriting income"
       }
      }
     },
     "localname": "UnderwritingIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/SegmentInformationResultsofOperationsoftheBusinessSegmentsDetails"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_UnearnedPremiums": {
     "auth_ref": [
      "r407"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets": {
       "order": 2.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date.",
        "label": "Unearned Premiums",
        "terseLabel": "Unearned premiums and other revenue (Exchanges - $219,582 and $252,553)",
        "verboseLabel": "Unearned premiums and other revenue"
       }
      }
     },
     "localname": "UnearnedPremiums",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheets",
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Variable Interest Entities (VIE) in which the entity does not have a controlling financial interest (as defined) and of which it is therefore not the primary beneficiary. VIEs of which the entity is not the primary beneficiary because it does not have the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and for which it does not have the obligation to absorb losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE are not included in the consolidated financial statements of the entity.",
        "label": "Variable Interest Entity, Not Primary Beneficiary [Member]",
        "terseLabel": "VIE, Not primary beneficiary"
       }
      }
     },
     "localname": "VariableInterestEntityNotPrimaryBeneficiaryMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties4455LBJFreewayLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedParties800SuperiorLLCDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesIllinoisCenterBuildingLPDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesLSCEntityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsRelatedPartiesNorthDearbornDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_VariableInterestEntityPrimaryBeneficiaryMember": {
     "auth_ref": [
      "r298"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Variable Interest Entities (VIE) in which the entity has a controlling financial interest (as defined) and of which it is therefore the primary beneficiary. A controlling financial interest is determined based on both: (a) the entity's power to direct activities of the VIE that most significantly impact the VIE's economic performance and (b) the entity's obligation to absorb losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. VIEs of which the entity is the primary beneficiary are included in the consolidated financial statements of the entity.",
        "label": "Variable Interest Entity, Primary Beneficiary [Member]",
        "terseLabel": "Reciprocal Exchanges"
       }
      }
     },
     "localname": "VariableInterestEntityPrimaryBeneficiaryMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/CondensedConsolidatedBalanceSheetsParenthetical",
      "http://www.nationalgeneral.com/role/DeferredAcquisitionCostsDetails",
      "http://www.nationalgeneral.com/role/FairValueofFinancialInstrumentsAssetsMeasuredonRecurringBasisDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsAvailableforSaleDebtSecuritiesbyContractualMaturityDetails",
      "http://www.nationalgeneral.com/role/InvestmentsCreditQualityofInvestmentsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsGrossUnrealizedLossesDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentIncomeDetails",
      "http://www.nationalgeneral.com/role/InvestmentsInvestmentQualityofCorporateBondsDetails",
      "http://www.nationalgeneral.com/role/InvestmentsNetRealizedGainsLossesDetails",
      "http://www.nationalgeneral.com/role/ReinsuranceNarrativeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationGrossPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetEarnedPremiumDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationNetPremiumWrittenDetails",
      "http://www.nationalgeneral.com/role/SegmentInformationServiceandFeeIncomeDetails",
      "http://www.nationalgeneral.com/role/UnpaidLossesandLossAdjustmentExpenseReservesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_VariableRateAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of variable rate.",
        "label": "Variable Rate [Axis]",
        "terseLabel": "Variable Rate"
       }
      }
     },
     "localname": "VariableRateAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_VariableRateDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest rate that fluctuates over time as a result of an underlying benchmark interest rate or index.",
        "label": "Variable Rate [Domain]",
        "terseLabel": "Variable Rate"
       }
      }
     },
     "localname": "VariableRateDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/DebtCreditAgreementDetails",
      "http://www.nationalgeneral.com/role/DebtDebtInstrumentsDetails",
      "http://www.nationalgeneral.com/role/DebtSubordinatedDebenturesDetails"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment": {
     "auth_ref": [
      "r115"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails": {
       "order": 2.0,
       "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.",
        "label": "Weighted Average Number Diluted Shares Outstanding Adjustment",
        "terseLabel": "Dilutive potential common shares"
       }
      }
     },
     "localname": "WeightedAverageNumberDilutedSharesOutstandingAdjustment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding": {
     "auth_ref": [
      "r107",
      "r115"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.",
        "label": "Weighted Average Number of Shares Outstanding, Diluted",
        "totalLabel": "Denominator for diluted EPS - weighted-average shares outstanding and assumed conversions"
       }
      }
     },
     "localname": "WeightedAverageNumberOfDilutedSharesOutstanding",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic": {
     "auth_ref": [
      "r105",
      "r115"
     ],
     "calculation": {
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails": {
       "order": 1.0,
       "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.",
        "label": "Weighted Average Number of Shares Outstanding, Basic",
        "verboseLabel": "Denominator for basic EPS - weighted-average shares outstanding"
       }
      }
     },
     "localname": "WeightedAverageNumberOfSharesOutstandingBasic",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.nationalgeneral.com/role/EarningsPerShareDetails"
     ],
     "xbrltype": "sharesItemType"
    }
   },
   "unitCount": 8
  }
 },
 "std_ref": {
  "r0": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760"
  },
  "r1": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "205",
   "URI": "http://asc.fasb.org/topic&trid=2122149"
  },
  "r10": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(22))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r100": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.12-04(a))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690"
  },
  "r101": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r102": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794"
  },
  "r103": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794"
  },
  "r104": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "250",
   "URI": "http://asc.fasb.org/topic&trid=2122394"
  },
  "r105": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256"
  },
  "r106": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1377-109256"
  },
  "r107": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1505-109256"
  },
  "r108": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1252-109256"
  },
  "r109": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1500-109256"
  },
  "r11": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(24))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r110": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1278-109256"
  },
  "r111": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "40",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1930-109256"
  },
  "r112": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1311-109256"
  },
  "r113": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "60B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=SL5780133-109256"
  },
  "r114": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256"
  },
  "r115": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
  },
  "r116": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
  },
  "r117": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "52",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117327953&loc=d3e4984-109258"
  },
  "r118": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "260",
   "URI": "http://asc.fasb.org/topic&trid=2144383"
  },
  "r119": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "270",
   "URI": "http://asc.fasb.org/extlink&oid=116846552&loc=d3e725-108305"
  },
  "r12": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(27))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r120": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "270",
   "URI": "http://asc.fasb.org/extlink&oid=116846552&loc=d3e765-108305"
  },
  "r121": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.10-01.(b)(6))",
   "Topic": "270",
   "URI": "http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699"
  },
  "r122": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8657-108599"
  },
  "r123": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599"
  },
  "r124": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r125": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r126": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r127": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r128": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r129": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r13": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(28))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r130": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r131": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r132": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599"
  },
  "r133": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599"
  },
  "r134": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "30",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599"
  },
  "r135": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599"
  },
  "r136": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599"
  },
  "r137": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "40",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9031-108599"
  },
  "r138": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "280",
   "URI": "http://asc.fasb.org/topic&trid=2134510"
  },
  "r139": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524"
  },
  "r14": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(29))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r140": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(3)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524"
  },
  "r141": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "29",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953659-111524"
  },
  "r142": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524"
  },
  "r143": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 4.E)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707"
  },
  "r144": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/subtopic&trid=2196772"
  },
  "r145": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "310",
   "URI": "http://asc.fasb.org/topic&trid=2196771"
  },
  "r146": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562"
  },
  "r147": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562"
  },
  "r148": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27405-111563"
  },
  "r149": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=SL6283291-111563"
  },
  "r15": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(3))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r150": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
  },
  "r151": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(aa)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
  },
  "r152": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(aaa)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
  },
  "r153": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
  },
  "r154": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
  },
  "r155": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
  },
  "r156": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
  },
  "r157": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563"
  },
  "r158": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563"
  },
  "r159": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563"
  },
  "r16": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r160": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563"
  },
  "r161": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563"
  },
  "r162": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563"
  },
  "r163": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563"
  },
  "r164": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(3)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563"
  },
  "r165": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563"
  },
  "r166": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563"
  },
  "r167": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27340-111563"
  },
  "r168": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)-(d)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563"
  },
  "r169": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "320",
   "URI": "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563"
  },
  "r17": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(3))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r170": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "320",
   "URI": "http://asc.fasb.org/topic&trid=2196928"
  },
  "r171": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "321",
   "URI": "http://asc.fasb.org/topic&trid=75115024"
  },
  "r172": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "05",
   "SubTopic": "10",
   "Topic": "323",
   "URI": "http://asc.fasb.org/extlink&oid=75018788&loc=d3e30768-111565"
  },
  "r173": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "323",
   "URI": "http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570"
  },
  "r174": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "323",
   "URI": "http://asc.fasb.org/extlink&oid=109237563&loc=d3e33775-111570"
  },
  "r175": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(1)",
   "Topic": "323",
   "URI": "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571"
  },
  "r176": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(b)",
   "Topic": "323",
   "URI": "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571"
  },
  "r177": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "323",
   "URI": "http://asc.fasb.org/topic&trid=2196965"
  },
  "r178": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "05",
   "SubTopic": "20",
   "Topic": "325",
   "URI": "http://asc.fasb.org/extlink&oid=75034700&loc=d3e39606-111590"
  },
  "r179": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "05",
   "SubTopic": "20",
   "Topic": "325",
   "URI": "http://asc.fasb.org/extlink&oid=75034700&loc=d3e39648-111590"
  },
  "r18": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r180": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "20",
   "Topic": "325",
   "URI": "http://asc.fasb.org/extlink&oid=75030709&loc=d3e39857-111592"
  },
  "r181": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "30",
   "SubTopic": "20",
   "Topic": "325",
   "URI": "http://asc.fasb.org/extlink&oid=75030756&loc=d3e39969-111593"
  },
  "r182": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "20",
   "Topic": "325",
   "URI": "http://asc.fasb.org/extlink&oid=75027002&loc=SL5920306-111594"
  },
  "r183": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "20",
   "Topic": "325",
   "URI": "http://asc.fasb.org/extlink&oid=75027002&loc=d3e40346-111594"
  },
  "r184": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "325",
   "URI": "http://asc.fasb.org/extlink&oid=73718008&loc=d3e42674-111610"
  },
  "r185": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "325",
   "URI": "http://asc.fasb.org/topic&trid=2197064"
  },
  "r186": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118950378&loc=SL82887624-210437"
  },
  "r187": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446"
  },
  "r188": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919244-210447"
  },
  "r189": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
  },
  "r19": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(31))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r190": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
  },
  "r191": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
  },
  "r192": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(f)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
  },
  "r193": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
  },
  "r194": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919253-210447"
  },
  "r195": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447"
  },
  "r196": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919260-210447"
  },
  "r197": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919272-210447"
  },
  "r198": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447"
  },
  "r199": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955255&loc=SL82921842-210448"
  },
  "r2": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
  },
  "r20": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(32))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r200": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454"
  },
  "r201": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118942338&loc=SL82922868-210454"
  },
  "r202": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455"
  },
  "r203": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455"
  },
  "r204": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922895-210455"
  },
  "r205": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922897-210455"
  },
  "r206": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455"
  },
  "r207": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455"
  },
  "r208": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(d)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455"
  },
  "r209": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(i)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455"
  },
  "r21": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.1)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r210": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455"
  },
  "r211": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456"
  },
  "r212": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266"
  },
  "r213": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975"
  },
  "r214": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
  },
  "r215": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274"
  },
  "r216": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "((a)(1),(b))",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r217": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r218": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230"
  },
  "r219": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869"
  },
  "r22": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.12)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r220": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 5.P.4(d))",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747"
  },
  "r221": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "440",
   "URI": "http://asc.fasb.org/topic&trid=2144648"
  },
  "r222": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349"
  },
  "r223": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349"
  },
  "r224": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "450",
   "URI": "http://asc.fasb.org/topic&trid=2127136"
  },
  "r225": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(4)",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248"
  },
  "r226": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601"
  },
  "r227": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=6802200&loc=SL6230698-112601"
  },
  "r228": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(1)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870"
  },
  "r229": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)(3)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870"
  },
  "r23": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(b),22(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r230": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870"
  },
  "r231": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870"
  },
  "r232": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "470",
   "URI": "http://asc.fasb.org/topic&trid=2208564"
  },
  "r233": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(CFRR 211.02)",
   "Topic": "480",
   "URI": "http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764"
  },
  "r234": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=65888546&loc=d3e21300-112643"
  },
  "r235": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21553-112644"
  },
  "r236": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644"
  },
  "r237": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644"
  },
  "r238": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644"
  },
  "r239": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21488-112644"
  },
  "r24": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19-26)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r240": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644"
  },
  "r241": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644"
  },
  "r242": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644"
  },
  "r243": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.3-04)",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770"
  },
  "r244": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655"
  },
  "r245": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656"
  },
  "r246": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "505",
   "URI": "http://asc.fasb.org/topic&trid=2208762"
  },
  "r247": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045"
  },
  "r248": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045"
  },
  "r249": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118944142&loc=SL49130690-203046-203046"
  },
  "r25": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.22(a)(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r250": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(ii)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r251": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(01)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r252": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(n)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r253": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921"
  },
  "r254": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "10",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116855982&loc=d3e4534-113899"
  },
  "r255": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
  },
  "r256": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
  },
  "r257": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
  },
  "r258": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(3)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r259": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a),(g)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r26": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.22)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r260": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r261": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r262": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(i)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r263": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(i)-(ii)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r264": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(ii)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r265": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(iv)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r266": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)(iv)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r267": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)(i)-(ii)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r268": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)(iii)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r269": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)(iii)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r27": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.28(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r270": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r271": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)(2)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r272": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r273": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)(1)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r274": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r275": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)(1)(i)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r276": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(i)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r277": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
  },
  "r278": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901"
  },
  "r279": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 14.F)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809"
  },
  "r28": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.28,29)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r280": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11149-113907"
  },
  "r281": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11178-113907"
  },
  "r282": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "718",
   "URI": "http://asc.fasb.org/topic&trid=2228938"
  },
  "r283": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319"
  },
  "r284": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319"
  },
  "r285": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=109238882&loc=d3e39076-109324"
  },
  "r286": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324"
  },
  "r287": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324"
  },
  "r288": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "740",
   "URI": "http://asc.fasb.org/topic&trid=2144680"
  },
  "r289": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683"
  },
  "r29": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.29,30)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r290": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683"
  },
  "r291": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "19",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683"
  },
  "r292": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683"
  },
  "r293": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(1)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r294": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(2)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r295": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r296": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(3)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r297": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c),(3)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r298": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=118582676&loc=d3e5710-111685"
  },
  "r299": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4I",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116874947&loc=SL4590271-111686"
  },
  "r3": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r30": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.29-31)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r300": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4J",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116874947&loc=SL4591551-111686"
  },
  "r301": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4K",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116874947&loc=SL4591552-111686"
  },
  "r302": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "810",
   "URI": "http://asc.fasb.org/topic&trid=2197479"
  },
  "r303": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4K",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(4)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5708775-113959"
  },
  "r304": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r305": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r306": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bb)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r307": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bbb)(1)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r308": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bbb)(2)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r309": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r31": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.30)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r310": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r311": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1a)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r312": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(2)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r313": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r314": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r315": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258"
  },
  "r316": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258"
  },
  "r317": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=116690757&loc=SL116692626-108610"
  },
  "r318": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611"
  },
  "r319": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13476-108611"
  },
  "r32": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.31)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r320": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "20",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118948100&loc=d3e30304-110892"
  },
  "r321": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "230",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906"
  },
  "r322": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32022-110900"
  },
  "r323": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "18",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32157-110900"
  },
  "r324": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(b)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r325": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(b,c)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r326": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(c)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r327": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r328": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901"
  },
  "r329": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391"
  },
  "r33": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226024-175313"
  },
  "r330": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399"
  },
  "r331": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399"
  },
  "r332": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399"
  },
  "r333": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400"
  },
  "r334": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)",
   "Topic": "840",
   "URI": "http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737"
  },
  "r335": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977"
  },
  "r336": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980"
  },
  "r337": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
  },
  "r338": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
  },
  "r339": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
  },
  "r34": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r340": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864"
  },
  "r341": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864"
  },
  "r342": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39678-107864"
  },
  "r343": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "850",
   "URI": "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864"
  },
  "r344": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "850",
   "URI": "http://asc.fasb.org/topic&trid=2122745"
  },
  "r345": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "855",
   "URI": "http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662"
  },
  "r346": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r347": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r348": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r349": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r35": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a-c)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r350": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "50",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746"
  },
  "r351": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61929-109447"
  },
  "r352": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61929-109447"
  },
  "r353": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62059-109447"
  },
  "r354": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62059-109447"
  },
  "r355": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62395-109447"
  },
  "r356": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62395-109447"
  },
  "r357": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "33",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447"
  },
  "r358": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "33",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447"
  },
  "r359": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "35A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(a)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447"
  },
  "r36": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r360": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "35A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(b)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447"
  },
  "r361": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(c)(1)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61872-109447"
  },
  "r362": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "235",
   "Subparagraph": "(c)(2)",
   "Topic": "932",
   "URI": "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61872-109447"
  },
  "r363": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "20",
   "Topic": "940",
   "URI": "http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953"
  },
  "r364": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(1)(a))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r365": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(10))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r366": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(11))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r367": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(13))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r368": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(15)(5))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r369": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(16))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r37": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r370": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(22))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r371": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(23))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r372": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(4))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r373": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(5))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r374": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(6)(a)(1))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r375": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(6))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r376": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.13(3)(a))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r377": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.15(1),(5))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r378": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.15)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r379": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(13)(c))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r38": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r380": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(13)(f))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r381": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(15))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r382": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(22))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r383": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(23))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r384": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.13(c),(d))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r385": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04.9)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r386": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803"
  },
  "r387": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Subparagraph": "(a)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803"
  },
  "r388": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Subparagraph": "(b)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803"
  },
  "r389": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Subparagraph": "(c)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803"
  },
  "r39": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580"
  },
  "r390": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Subparagraph": "(d)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803"
  },
  "r391": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "320",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803"
  },
  "r392": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "405",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817"
  },
  "r393": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "405",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818"
  },
  "r394": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "470",
   "Subparagraph": "e",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823"
  },
  "r395": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "470",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823"
  },
  "r396": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=6480726&loc=d3e6691-158385"
  },
  "r397": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387"
  },
  "r398": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=99397103&loc=d3e6816-158387"
  },
  "r399": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387"
  },
  "r4": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(13))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r40": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580"
  },
  "r400": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "20",
   "Subparagraph": "(2)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904"
  },
  "r401": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(13)(a))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r402": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(16))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r403": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(5))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r404": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(1)(g))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r405": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(10))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r406": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(12))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r407": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(13)(a)(2))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r408": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(15)(5))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r409": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(16))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r41": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580"
  },
  "r410": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(2))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r411": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(23)(a)(4))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r412": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(24))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r413": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(25))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r414": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(4))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r415": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(7))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r416": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(8))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r417": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.1(f,g))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r418": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.1(h))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r419": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.13(a)(3),(c))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r42": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580"
  },
  "r420": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.13(c))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r421": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.15)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r422": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.3)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r423": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.5)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r424": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.7)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r425": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(1))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r426": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(10))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r427": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(18))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r428": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(19))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r429": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(2))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r43": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e689-108580"
  },
  "r430": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(7)(a))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r431": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(8))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r432": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04.2)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r433": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04.4)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r434": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04.5)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r435": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04.5,6,7)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r436": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "235",
   "Subparagraph": "(SX 210.12-17(Column B))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915"
  },
  "r437": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "235",
   "Subparagraph": "(SX 210.12-17(Column C))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915"
  },
  "r438": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "235",
   "Subparagraph": "(SX 210.12-17(Column D))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915"
  },
  "r439": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "235",
   "Subparagraph": "(SX 210.12-17(Column E))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915"
  },
  "r44": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL34724391-108580"
  },
  "r440": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "235",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915"
  },
  "r441": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415"
  },
  "r442": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(c)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415"
  },
  "r443": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415"
  },
  "r444": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=117419109&loc=SL117422543-158416"
  },
  "r445": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(b)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=117419109&loc=SL117422543-158416"
  },
  "r446": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=117419109&loc=SL117422543-158416"
  },
  "r447": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "30",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=117418976&loc=d3e11522-158419"
  },
  "r448": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "30",
   "Topic": "944",
   "URI": "http://asc.fasb.org/subtopic&trid=4737841"
  },
  "r449": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "310",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489"
  },
  "r45": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580"
  },
  "r450": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "310",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=99404803&loc=d3e21412-158489"
  },
  "r451": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "340",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=6485982&loc=d3e22818-158507"
  },
  "r452": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Subparagraph": "(a)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437"
  },
  "r453": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Subparagraph": "(b)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437"
  },
  "r454": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Subparagraph": "(c)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437"
  },
  "r455": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Subparagraph": "(cc)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437"
  },
  "r456": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437"
  },
  "r457": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4H",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116884468&loc=SL65671331-158438"
  },
  "r458": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13H",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Subparagraph": "(a)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=117419784&loc=SL117783719-158441"
  },
  "r459": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13H",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Subparagraph": "(c)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=117419784&loc=SL117783719-158441"
  },
  "r46": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580"
  },
  "r460": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9C",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Subparagraph": "(a)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116884803&loc=SL65671395-207642"
  },
  "r461": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "40",
   "Subparagraph": "(g)(1)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=117419843&loc=SL117420844-207641"
  },
  "r462": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "SubTopic": "40",
   "Topic": "944",
   "URI": "http://asc.fasb.org/subtopic&trid=2560295"
  },
  "r463": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "605",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=6486390&loc=d3e25715-158539"
  },
  "r464": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "605",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=6486390&loc=d3e25718-158539"
  },
  "r465": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "605",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=84167274&loc=d3e27175-158546"
  },
  "r466": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "605",
   "Subparagraph": "(a)(2)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547"
  },
  "r467": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "605",
   "Subparagraph": "(b)(1)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547"
  },
  "r468": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "605",
   "Subparagraph": "(b)(2)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547"
  },
  "r469": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "605",
   "Subparagraph": "(b)(3)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547"
  },
  "r47": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580"
  },
  "r470": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "605",
   "Subparagraph": "(c)(1)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547"
  },
  "r471": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "605",
   "Subparagraph": "(c)(2)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547"
  },
  "r472": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "605",
   "Subparagraph": "(c)(3)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547"
  },
  "r473": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "605",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547"
  },
  "r474": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "605",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=99379264&loc=d3e27758-158548"
  },
  "r475": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "605",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=99379264&loc=d3e27830-158548"
  },
  "r476": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "80",
   "Subparagraph": "(e)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=117420044&loc=d3e19393-158473"
  },
  "r477": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "825",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=117420823&loc=d3e32546-158582"
  },
  "r478": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "825",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=75763970&loc=SL75763979-209797"
  },
  "r479": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "825",
   "Subparagraph": "(a)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=99380617&loc=SL75241803-196195"
  },
  "r48": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580"
  },
  "r480": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "825",
   "Subparagraph": "(b)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=99380617&loc=SL75241803-196195"
  },
  "r481": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "825",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=99380617&loc=SL75241803-196195"
  },
  "r482": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "944",
   "URI": "http://asc.fasb.org/topic&trid=2303980"
  },
  "r483": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12(2)(i))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010"
  },
  "r484": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12)",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010"
  },
  "r485": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12C(1)(a))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010"
  },
  "r486": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-12C)",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010"
  },
  "r487": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-13(1))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010"
  },
  "r488": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-13)",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010"
  },
  "r489": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-14)",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010"
  },
  "r49": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580"
  },
  "r490": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "320",
   "Subparagraph": "(SX 210.12-15(Column A))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010"
  },
  "r491": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Footnote 4))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024"
  },
  "r492": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b"
  },
  "r493": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "d1-1"
  },
  "r494": {
   "Name": "Form 10-Q",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "308",
   "Subsection": "a"
  },
  "r495": {
   "Name": "Forms 10-K, 10-Q, 20-F",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13",
   "Subsection": "a-1"
  },
  "r496": {
   "Name": "Regulation 12B",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b-2"
  },
  "r497": {
   "Name": "Regulation S-T",
   "Number": "232",
   "Publisher": "SEC",
   "Section": "405"
  },
  "r5": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(14))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r50": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580"
  },
  "r51": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e557-108580"
  },
  "r52": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581"
  },
  "r53": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(210.5-03(11))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r54": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(1))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r55": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(10))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r56": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(12))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r57": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(20))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r58": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(21))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r59": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(5))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r6": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(17))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r60": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.21)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r61": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.4)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r62": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.7(a),(b))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r63": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.7(b))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r64": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.7(c),9(a))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r65": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.8)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r66": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.9)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r67": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3151-108585"
  },
  "r68": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585"
  },
  "r69": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585"
  },
  "r7": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(19))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r70": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
  },
  "r71": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
  },
  "r72": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
  },
  "r73": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
  },
  "r74": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585"
  },
  "r75": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585"
  },
  "r76": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
  },
  "r77": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
  },
  "r78": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3000-108585"
  },
  "r79": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21D",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=SL94080555-108585"
  },
  "r8": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(2))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r80": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "24",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585"
  },
  "r81": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585"
  },
  "r82": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585"
  },
  "r83": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
  },
  "r84": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
  },
  "r85": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
  },
  "r86": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585"
  },
  "r87": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586"
  },
  "r88": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586"
  },
  "r89": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790"
  },
  "r9": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(20))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r90": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(d)(1))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r91": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(h))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r92": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(k))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r93": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(m)(1)(iii))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r94": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(b))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r95": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(d)(1))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r96": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(d),(e))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r97": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(e),(f))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r98": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(h)(2))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r99": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(k)(1))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  }
 },
 "version": "2.1"
}
