3.7.0.1 html 749 669 1 true 218 0 false 9 false false R1.htm 1001 - Document - Document and Entity Information Sheet http://www.globalindemnity.ie/taxonomy/role/DocumentandEntityInformation Document and Entity Information Cover 1 false false R2.htm 1003 - Statement - Consolidated Balance Sheets Sheet http://www.globalindemnity.ie/taxonomy/role/StatementOfFinancialPositionUnclassified-InvestmentBasedOperations Consolidated Balance Sheets Statements 2 false false R3.htm 1004 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.globalindemnity.ie/taxonomy/role/StatementOfFinancialPositionUnclassified-InvestmentBasedOperationsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 1005 - Statement - Consolidated Statements of Operations Sheet http://www.globalindemnity.ie/taxonomy/role/StatementOfIncomeInsuranceBasedRevenue Consolidated Statements of Operations Statements 4 false false R5.htm 1006 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.globalindemnity.ie/taxonomy/role/StatementOfOtherComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 5 false false R6.htm 1007 - Statement - Consolidated Statements of Changes in Shareholders' Equity Sheet http://www.globalindemnity.ie/taxonomy/role/StatementOfShareholdersEquityAndOtherComprehensiveIncome Consolidated Statements of Changes in Shareholders' Equity Statements 6 false false R7.htm 1008 - Statement - Consolidated Statements of Cash Flows Sheet http://www.globalindemnity.ie/taxonomy/role/StatementOfCashFlowsIndirectInvestmentBasedOperations Consolidated Statements of Cash Flows Statements 7 false false R8.htm 1009 - Statement - Consolidated Statements of Cash Flows (Parenthetical) Sheet http://www.globalindemnity.ie/taxonomy/role/StatementOfCashFlowsIndirectInvestmentBasedOperationsParenthetical Consolidated Statements of Cash Flows (Parenthetical) Statements 8 false false R9.htm 1010 - Disclosure - Principles of Consolidation and Basis of Presentation Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock Principles of Consolidation and Basis of Presentation Notes 9 false false R10.htm 1011 - Disclosure - Redomestication Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsRedomesticationTextBlock Redomestication Notes 10 false false R11.htm 1012 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlock Summary of Significant Accounting Policies Notes 11 false false R12.htm 1013 - Disclosure - Acquisition Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlock Acquisition Notes 12 false false R13.htm 1014 - Disclosure - Investments Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsInvestmentTextBlock Investments Notes 13 false false R14.htm 1015 - Disclosure - Derivative Instruments Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsDerivativesAndFairValueTextBlock Derivative Instruments Notes 14 false false R15.htm 1016 - Disclosure - Fair Value Measurements Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock Fair Value Measurements Notes 15 false false R16.htm 1017 - Disclosure - Goodwill and Intangible Assets Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlock Goodwill and Intangible Assets Notes 16 false false R17.htm 1018 - Disclosure - Reinsurance Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsReinsuranceTextBlock Reinsurance Notes 17 false false R18.htm 1019 - Disclosure - Income Taxes Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlock Income Taxes Notes 18 false false R19.htm 1020 - Disclosure - Liability for Unpaid Losses and Loss Adjustment Expenses Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsLiabilityForFuturePolicyBenefitsAndUnpaidClaimsDisclosureTextBlock Liability for Unpaid Losses and Loss Adjustment Expenses Notes 19 false false R20.htm 1021 - Disclosure - Debt Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlock Debt Notes 20 false false R21.htm 1022 - Disclosure - Shareholders' Equity Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock Shareholders' Equity Notes 21 false false R22.htm 1023 - Disclosure - Related Party Transactions Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock Related Party Transactions Notes 22 false false R23.htm 1024 - Disclosure - Commitments and Contingencies Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock Commitments and Contingencies Notes 23 false false R24.htm 1025 - Disclosure - Share-Based Compensation Plans Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock Share-Based Compensation Plans Notes 24 false false R25.htm 1026 - Disclosure - 401(k) Plan Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsCompensationAndEmployeeBenefitPlansTextBlock 401(k) Plan Notes 25 false false R26.htm 1027 - Disclosure - Earnings Per Share Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock Earnings Per Share Notes 26 false false R27.htm 1028 - Disclosure - Statutory Financial Information Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsStatutoryFinancialInformationTextBlock Statutory Financial Information Notes 27 false false R28.htm 1029 - Disclosure - Segment Information Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlock Segment Information Notes 28 false false R29.htm 1030 - Disclosure - Supplemental Cash Flow Information Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsCashFlowSupplementalDisclosuresTextBlock Supplemental Cash Flow Information Notes 29 false false R30.htm 1031 - Disclosure - New Accounting Pronouncements Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsDescriptionOfNewAccountingPronouncementsTextBlock New Accounting Pronouncements Notes 30 false false R31.htm 1032 - Disclosure - Summary of Quarterly Financial Information (Unaudited) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsQuarterlyFinancialInformationTextBlock Summary of Quarterly Financial Information (Unaudited) Notes 31 false false R32.htm 1033 - Disclosure - Subsequent events Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsSubsequentEventsTextBlock Subsequent events Notes 32 false false R33.htm 1034 - Disclosure - Summary of Investments - Other Than Investments in Related Parties Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsSummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesTextBlock Summary of Investments - Other Than Investments in Related Parties Notes 33 false false R34.htm 1035 - Disclosure - Condensed Financial Information of Registrant (Parent Only) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsCondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock Condensed Financial Information of Registrant (Parent Only) Notes 34 false false R35.htm 1036 - Disclosure - Supplementary Insurance Information Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsSupplementaryInsuranceInformationForInsuranceCompaniesDisclosureTextBlock Supplementary Insurance Information Notes 35 false false R36.htm 1037 - Disclosure - Reinsurance Earned Premiums Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsSupplementalScheduleOfReinsurancePremiumsForInsuranceCompaniesTextBlock Reinsurance Earned Premiums Notes 36 false false R37.htm 1038 - Disclosure - Valuation and Qualifying Accounts and Reserves Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock Valuation and Qualifying Accounts and Reserves Notes 37 false false R38.htm 1039 - Disclosure - Supplementary Information For Property Casualty Underwriters Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsScheduleOfSupplementalInformationForPropertyCasualtyInsuranceUnderwritersTextBlock Supplementary Information For Property Casualty Underwriters Notes 38 false false R39.htm 1040 - Disclosure - Principles of Consolidation and Basis of Presentation (Policies) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlockPolicies Principles of Consolidation and Basis of Presentation (Policies) Policies http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlock 39 false false R40.htm 1041 - Disclosure - Acquisition (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlockTables Acquisition (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlock 40 false false R41.htm 1042 - Disclosure - Investments (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsInvestmentTextBlockTables Investments (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsInvestmentTextBlock 41 false false R42.htm 1043 - Disclosure - Derivative Instruments (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsDerivativesAndFairValueTextBlockTables Derivative Instruments (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsDerivativesAndFairValueTextBlock 42 false false R43.htm 1044 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlockTables Fair Value Measurements (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock 43 false false R44.htm 1045 - Disclosure - Goodwill and Intangible Assets (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlockTables Goodwill and Intangible Assets (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlock 44 false false R45.htm 1046 - Disclosure - Reinsurance (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsReinsuranceTextBlockTables Reinsurance (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsReinsuranceTextBlock 45 false false R46.htm 1047 - Disclosure - Income Taxes (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlockTables Income Taxes (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlock 46 false false R47.htm 1048 - Disclosure - Liability for Unpaid Losses and Loss Adjustment Expenses (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsLiabilityForFuturePolicyBenefitsAndUnpaidClaimsDisclosureTextBlockTables Liability for Unpaid Losses and Loss Adjustment Expenses (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsLiabilityForFuturePolicyBenefitsAndUnpaidClaimsDisclosureTextBlock 47 false false R48.htm 1049 - Disclosure - Debt (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlockTables Debt (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlock 48 false false R49.htm 1050 - Disclosure - Shareholders' Equity (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlockTables Shareholders' Equity (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock 49 false false R50.htm 1051 - Disclosure - Related Party Transactions (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlockTables Related Party Transactions (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock 50 false false R51.htm 1052 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlockTables Commitments and Contingencies (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock 51 false false R52.htm 1053 - Disclosure - Share-Based Compensation Plans (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlockTables Share-Based Compensation Plans (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock 52 false false R53.htm 1054 - Disclosure - Earnings Per Share (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlockTables Earnings Per Share (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock 53 false false R54.htm 1055 - Disclosure - Statutory Financial Information (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsStatutoryFinancialInformationTextBlockTables Statutory Financial Information (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsStatutoryFinancialInformationTextBlock 54 false false R55.htm 1056 - Disclosure - Segment Information (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables Segment Information (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlock 55 false false R56.htm 1057 - Disclosure - Supplemental Cash Flow Information (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsCashFlowSupplementalDisclosuresTextBlockTables Supplemental Cash Flow Information (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsCashFlowSupplementalDisclosuresTextBlock 56 false false R57.htm 1058 - Disclosure - Summary of Quarterly Financial Information (Unaudited) (Tables) Sheet http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsQuarterlyFinancialInformationTextBlockTables Summary of Quarterly Financial Information (Unaudited) (Tables) Tables http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsQuarterlyFinancialInformationTextBlock 57 false false R58.htm 1059 - Disclosure - Principles of Consolidation and Basis of Presentation - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosurePrinciplesOfConsolidationAndBasisOfPresentationAdditionalInformation Principles of Consolidation and Basis of Presentation - Additional Information (Detail) Details 58 false false R59.htm 1060 - Disclosure - Redomestication - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureRedomesticationAdditionalInformation Redomestication - Additional Information (Detail) Details 59 false false R60.htm 1061 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformation Summary of Significant Accounting Policies - Additional Information (Detail) Details 60 false false R61.htm 1062 - Disclosure - Acquisition - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureAcquisitionAdditionalInformation Acquisition - Additional Information (Detail) Details 61 false false R62.htm 1063 - Disclosure - Schedule of Unaudited Pro Forma Consolidated Results of Operations (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureScheduleOfUnauditedProFormaConsolidatedResultsOfOperations Schedule of Unaudited Pro Forma Consolidated Results of Operations (Detail) Details 62 false false R63.htm 1064 - Disclosure - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureEstimatedFairValueOfAssetsAcquiredAndLiabilitiesAssumed Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) Details 63 false false R64.htm 1065 - Disclosure - Valuation of Intangible Assets (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureValuationOfIntangibleAssets Valuation of Intangible Assets (Detail) Details 64 false false R65.htm 1066 - Disclosure - Intangible Assets Arising from Acquisitions (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureIntangibleAssetsArisingFromAcquisitions Intangible Assets Arising from Acquisitions (Detail) Details 65 false false R66.htm 1067 - Disclosure - Expected Amortization Expense Related to American Reliable (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureExpectedAmortizationExpenseRelatedToAmericanReliable Expected Amortization Expense Related to American Reliable (Detail) Details 66 false false R67.htm 1068 - Disclosure - Fair Value, Gross Contractual Amounts Due, and Contractual Cash Flows Not Expected to be Collected of Acquired Receivables (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureFairValueGrossContractualAmountsDueAndContractualCashFlowsNotExpectedToBeCollectedOfAcquiredReceivables Fair Value, Gross Contractual Amounts Due, and Contractual Cash Flows Not Expected to be Collected of Acquired Receivables (Detail) Details 67 false false R68.htm 1069 - Disclosure - Schedule of Amortized Cost and Estimated Fair Value of Investments (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureScheduleOfAmortizedCostAndEstimatedFairValueOfInvestments Schedule of Amortized Cost and Estimated Fair Value of Investments (Detail) Details 68 false false R69.htm 1070 - Disclosure - Investments - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureInvestmentsAdditionalInformation Investments - Additional Information (Detail) Details 69 false false R70.htm 1071 - Disclosure - Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfAmortizedCostAndEstimatedFairValueThroughFixedMaturities Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) Details 70 false false R71.htm 1072 - Disclosure - Summary of Securities with Gross Unrealized Losses (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfSecuritiesWithGrossUnrealizedLosses Summary of Securities with Gross Unrealized Losses (Detail) Details 71 false false R72.htm 1073 - Disclosure - Schedule of Other Than Temporary Impairments on Investments (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureScheduleOfOtherThanTemporaryImpairmentsOnInvestments Schedule of Other Than Temporary Impairments on Investments (Detail) Details 72 false false R73.htm 1074 - Disclosure - Schedule of Credit Losses Recognized in Earnings (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureScheduleOfCreditLossesRecognizedInEarnings Schedule of Credit Losses Recognized in Earnings (Detail) Details 73 false false R74.htm 1075 - Disclosure - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureScheduleOfAccumulatedOtherComprehensiveIncomeNetOfTax Schedule of Accumulated Other Comprehensive Income, Net of Tax (Detail) Details 74 false false R75.htm 1076 - Disclosure - Changes in Accumulated Other Comprehensive Income (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureChangesInAccumulatedOtherComprehensiveIncome Changes in Accumulated Other Comprehensive Income (Detail) Details 75 false false R76.htm 1077 - Disclosure - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureReclassificationsOutOfAccumulatedOtherComprehensiveIncome Reclassifications Out of Accumulated Other Comprehensive Income (Detail) Details 76 false false R77.htm 1078 - Disclosure - Components of Net Realized Investment Gains (Losses) (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureComponentsOfNetRealizedInvestmentGainsLosses Components of Net Realized Investment Gains (Losses) (Detail) Details 77 false false R78.htm 1079 - Disclosure - Components of Net Realized Investment Gains (Losses) (Parenthetical) (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureComponentsOfNetRealizedInvestmentGainsLossesParenthetical Components of Net Realized Investment Gains (Losses) (Parenthetical) (Detail) Details 78 false false R79.htm 1080 - Disclosure - Schedule of Proceeds From Sales of Available for Sale Securities (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureScheduleOfProceedsFromSalesOfAvailableForSaleSecurities Schedule of Proceeds From Sales of Available for Sale Securities (Detail) Details 79 false false R80.htm 1081 - Disclosure - Schedule of Investment Income (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureScheduleOfInvestmentIncome Schedule of Investment Income (Detail) Details 80 false false R81.htm 1082 - Disclosure - Schedule of Investment Income (Parenthetical) (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureScheduleOfInvestmentIncomeParenthetical Schedule of Investment Income (Parenthetical) (Detail) Details 81 false false R82.htm 1083 - Disclosure - Schedule of Total Investment Return (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureScheduleOfTotalInvestmentReturn Schedule of Total Investment Return (Detail) Details 82 false false R83.htm 1084 - Disclosure - Summary of Insurance Enhanced Municipal Bonds Backed by Financial Guarantors (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfInsuranceEnhancedMunicipalBondsBackedByFinancialGuarantors Summary of Insurance Enhanced Municipal Bonds Backed by Financial Guarantors (Detail) Details 83 false false R84.htm 1085 - Disclosure - Summary of Estimated Fair Values of Bonds Held on Deposit (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfEstimatedFairValuesOfBondsHeldOnDeposit Summary of Estimated Fair Values of Bonds Held on Deposit (Detail) Details 84 false false R85.htm 1086 - Disclosure - Summarized Information of Location and Gross Amount of Derivatives' Fair Value in Consolidated Balance Sheets (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummarizedInformationOfLocationAndGrossAmountOfDerivativesFairValueInConsolidatedBalanceSheets Summarized Information of Location and Gross Amount of Derivatives' Fair Value in Consolidated Balance Sheets (Detail) Details 85 false false R86.htm 1087 - Disclosure - Summary of Net Gains (Losses) Included in Consolidated Statements of Operations for Changes in Fair Value of Derivatives and Periodic Net Interest Settlements Under Derivatives (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfNetGainsLossesIncludedInConsolidatedStatementsOfOperationsForChangesInFairValueOfDerivativesAndPeriodicNetInterestSettlementsUnderDerivatives Summary of Net Gains (Losses) Included in Consolidated Statements of Operations for Changes in Fair Value of Derivatives and Periodic Net Interest Settlements Under Derivatives (Detail) Details 86 false false R87.htm 1088 - Disclosure - Derivative Instruments - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureDerivativeInstrumentsAdditionalInformation Derivative Instruments - Additional Information (Detail) Details 87 false false R88.htm 1089 - Disclosure - Company's Invested Assets and Derivative Instruments Measured at Fair Value on Recurring Basis (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureCompanysInvestedAssetsAndDerivativeInstrumentsMeasuredAtFairValueOnRecurringBasis Company's Invested Assets and Derivative Instruments Measured at Fair Value on Recurring Basis (Detail) Details 88 false false R89.htm 1090 - Disclosure - Company's Invested Assets and Derivative Instruments Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureCompanysInvestedAssetsAndDerivativeInstrumentsMeasuredAtFairValueOnRecurringBasisParenthetical Company's Invested Assets and Derivative Instruments Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) Details 89 false false R90.htm 1091 - Disclosure - Current Fair Value of Debt (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureCurrentFairValueOfDebt Current Fair Value of Debt (Detail) Details 90 false false R91.htm 1092 - Disclosure - Current Fair Value of Debt (Parenthetical) (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureCurrentFairValueOfDebtParenthetical Current Fair Value of Debt (Parenthetical) (Detail) Details 91 false false R92.htm 1093 - Disclosure - Fair Value Measurements - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureFairValueMeasurementsAdditionalInformation Fair Value Measurements - Additional Information (Detail) Details 92 false false R93.htm 1094 - Disclosure - Changes in Level 3 Investments Measured at Fair Value on Recurring Basis (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureChangesInLevel3InvestmentsMeasuredAtFairValueOnRecurringBasis Changes in Level 3 Investments Measured at Fair Value on Recurring Basis (Detail) Details 93 false false R94.htm 1095 - Disclosure - Fair Value and Future Funding Commitments Related to These Investments (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureFairValueAndFutureFundingCommitmentsRelatedToTheseInvestments Fair Value and Future Funding Commitments Related to These Investments (Detail) Details 94 false false R95.htm 1096 - Disclosure - Fair Value and Future Funding Commitments Related to These Investments (Parenthetical) (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureFairValueAndFutureFundingCommitmentsRelatedToTheseInvestmentsParenthetical Fair Value and Future Funding Commitments Related to These Investments (Parenthetical) (Detail) Details 95 false false R96.htm 1097 - Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformation Goodwill and Intangible Assets - Additional Information (Detail) Details 96 false false R97.htm 1098 - Disclosure - Summary of Changes In Carrying Amount of Goodwill By Segment (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfChangesInCarryingAmountOfGoodwillBySegment Summary of Changes In Carrying Amount of Goodwill By Segment (Detail) Details 97 false false R98.htm 1099 - Disclosure - Intangible Assets (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureIntangibleAssets Intangible Assets (Detail) Details 98 false false R99.htm 1100 - Disclosure - Expected Amortization Expense (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureExpectedAmortizationExpense Expected Amortization Expense (Detail) Details 99 false false R100.htm 1101 - Disclosure - Reinsurance Balances (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureReinsuranceBalances Reinsurance Balances (Detail) Details 100 false false R101.htm 1102 - Disclosure - Reinsurance - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureReinsuranceAdditionalInformation Reinsurance - Additional Information (Detail) Details 101 false false R102.htm 1103 - Disclosure - Unsecured Reinsurance Receivable (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureUnsecuredReinsuranceReceivable Unsecured Reinsurance Receivable (Detail) Details 102 false false R103.htm 1104 - Disclosure - Effect of Reinsurance on Premiums Written and Earned (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureEffectOfReinsuranceOnPremiumsWrittenAndEarned Effect of Reinsurance on Premiums Written and Earned (Detail) Details 103 false false R104.htm 1105 - Disclosure - Effect of Reinsurance on Premiums Written and Earned (Parenthetical) (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureEffectOfReinsuranceOnPremiumsWrittenAndEarnedParenthetical Effect of Reinsurance on Premiums Written and Earned (Parenthetical) (Detail) Details 104 false false R105.htm 1106 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureIncomeTaxesAdditionalInformation Income Taxes - Additional Information (Detail) Details 105 false false R106.htm 1107 - Disclosure - Income Before Income Taxes from its Non-U.S. Subsidiaries and U.S. Subsidiaries (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureIncomeBeforeIncomeTaxesFromItsNonUSSubsidiariesAndUSSubsidiaries Income Before Income Taxes from its Non-U.S. Subsidiaries and U.S. Subsidiaries (Detail) Details 106 false false R107.htm 1108 - Disclosure - Components of Income Tax Expense (Benefit) (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureComponentsOfIncomeTaxExpenseBenefit Components of Income Tax Expense (Benefit) (Detail) Details 107 false false R108.htm 1109 - Disclosure - Differences in Tax Provision for Financial Statement Purposes and Expected Tax Provision at Weighted Average Tax Rate (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureDifferencesInTaxProvisionForFinancialStatementPurposesAndExpectedTaxProvisionAtWeightedAverageTaxRate Differences in Tax Provision for Financial Statement Purposes and Expected Tax Provision at Weighted Average Tax Rate (Detail) Details 108 false false R109.htm 1110 - Disclosure - Tax Effects of Temporary Differences That Give Rise to Significant Portions of Net Deferred Tax Assets (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureTaxEffectsOfTemporaryDifferencesThatGiveRiseToSignificantPortionsOfNetDeferredTaxAssets Tax Effects of Temporary Differences That Give Rise to Significant Portions of Net Deferred Tax Assets (Detail) Details 109 false false R110.htm 1111 - Disclosure - Summarized Activity in Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummarizedActivityInLiabilityForUnpaidLossesAndLossAdjustmentExpenses Summarized Activity in Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) Details 110 false false R111.htm 1112 - Disclosure - Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureLiabilityForUnpaidLossesAndLossAdjustmentExpensesAdditionalInformation Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) Details 111 false false R112.htm 1113 - Disclosure - Gross Reserves for Asbestos and Environmental Losses (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureGrossReservesForAsbestosAndEnvironmentalLosses Gross Reserves for Asbestos and Environmental Losses (Detail) Details 112 false false R113.htm 1114 - Disclosure - Net Reserves for Asbestos and Environmental Losses (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureNetReservesForAsbestosAndEnvironmentalLosses Net Reserves for Asbestos and Environmental Losses (Detail) Details 113 false false R114.htm 1115 - Disclosure - Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureIncurredClaimsAndAllocatedClaimAdjustmentExpensesNetOfReinsurance Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail) Details 114 false false R115.htm 1116 - Disclosure - Supplementary Information about Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSupplementaryInformationAboutCumulativePaidClaimsAndAllocatedClaimAdjustmentExpensesNetOfReinsurance Supplementary Information about Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail) Details 115 false false R116.htm 1117 - Disclosure - Supplementary Information of Average Historical Claims (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSupplementaryInformationOfAverageHistoricalClaims Supplementary Information of Average Historical Claims (Detail) Details 116 false false R117.htm 1118 - Disclosure - Reconciliation of Net Incurred and Paid Claims Development Tables to Liability for Unpaid Losses and Loss Adjustment Expenses in Consolidated Balance Sheets (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureReconciliationOfNetIncurredAndPaidClaimsDevelopmentTablesToLiabilityForUnpaidLossesAndLossAdjustmentExpensesInConsolidatedBalanceSheets Reconciliation of Net Incurred and Paid Claims Development Tables to Liability for Unpaid Losses and Loss Adjustment Expenses in Consolidated Balance Sheets (Detail) Details 117 false false R118.htm 1119 - Disclosure - Outstanding Debt Consisted (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureOutstandingDebtConsisted Outstanding Debt Consisted (Detail) Details 118 false false R119.htm 1120 - Disclosure - Outstanding Debt Consisted (Parenthetical) (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureOutstandingDebtConsistedParenthetical Outstanding Debt Consisted (Parenthetical) (Detail) Details 119 false false R120.htm 1121 - Disclosure - Debt - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureDebtAdditionalInformation Debt - Additional Information (Detail) Details 120 false false R121.htm 1122 - Disclosure - Amounts Recorded for Margin Borrowing Facilities and 7.75% Subordinated Notes (Detail) Notes http://www.globalindemnity.ie/taxonomy/role/DisclosureAmountsRecordedForMarginBorrowingFacilitiesAnd775SubordinatedNotes Amounts Recorded for Margin Borrowing Facilities and 7.75% Subordinated Notes (Detail) Details 121 false false R122.htm 1123 - Disclosure - Shareholders' Equity - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureShareholdersEquityAdditionalInformation Shareholders' Equity - Additional Information (Detail) Details 122 false false R123.htm 1124 - Disclosure - Information with Respect to Ordinary Shares that were Surrendered, Repurchased or Redeemed (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureInformationWithRespectToOrdinarySharesThatWereSurrenderedRepurchasedOrRedeemed Information with Respect to Ordinary Shares that were Surrendered, Repurchased or Redeemed (Detail) Details 123 false false R124.htm 1125 - Disclosure - Information with Respect to Ordinary Shares that were Surrendered, Repurchased or Redeemed (Parenthetical) (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureInformationWithRespectToOrdinarySharesThatWereSurrenderedRepurchasedOrRedeemedParenthetical Information with Respect to Ordinary Shares that were Surrendered, Repurchased or Redeemed (Parenthetical) (Detail) Details 124 false false R125.htm 1126 - Disclosure - Related Party Transactions - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformation Related Party Transactions - Additional Information (Detail) Details 125 false false R126.htm 1127 - Disclosure - Estimated Earned Premium and Incurred Losses (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureEstimatedEarnedPremiumAndIncurredLosses Estimated Earned Premium and Incurred Losses (Detail) Details 126 false false R127.htm 1128 - Disclosure - Net Payable Balances due from Global Indemnity Reinsurance (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureNetPayableBalancesDueFromGlobalIndemnityReinsurance Net Payable Balances due from Global Indemnity Reinsurance (Detail) Details 127 false false R128.htm 1129 - Disclosure - Commitments And Contingencies - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformation Commitments And Contingencies - Additional Information (Detail) Details 128 false false R129.htm 1130 - Disclosure - Future Minimum Cash Payments Under Non-cancelable Operating Leases (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureFutureMinimumCashPaymentsUnderNoncancelableOperatingLeases Future Minimum Cash Payments Under Non-cancelable Operating Leases (Detail) Details 129 false false R130.htm 1131 - Disclosure - Share-Based Compensation Plans - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureShareBasedCompensationPlansAdditionalInformation Share-Based Compensation Plans - Additional Information (Detail) Details 130 false false R131.htm 1132 - Disclosure - Summary of Award Activity for Stock Options Granted and Weighted Average Exercise Price Per Share (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfAwardActivityForStockOptionsGrantedAndWeightedAverageExercisePricePerShare Summary of Award Activity for Stock Options Granted and Weighted Average Exercise Price Per Share (Detail) Details 131 false false R132.htm 1133 - Disclosure - Option Intrinsic Values (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureOptionIntrinsicValues Option Intrinsic Values (Detail) Details 132 false false R133.htm 1134 - Disclosure - Options Exercisable (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureOptionsExercisable Options Exercisable (Detail) Details 133 false false R134.htm 1135 - Disclosure - Significant Assumptions Used To Estimate Fair Value of Stock Options Granted Using Black Scholes Option Pricing Model (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSignificantAssumptionsUsedToEstimateFairValueOfStockOptionsGrantedUsingBlackScholesOptionPricingModel Significant Assumptions Used To Estimate Fair Value of Stock Options Granted Using Black Scholes Option Pricing Model (Detail) Details 134 false false R135.htm 1136 - Disclosure - Summary of Range of Exercise Prices of Options Outstanding (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfRangeOfExercisePricesOfOptionsOutstanding Summary of Range of Exercise Prices of Options Outstanding (Detail) Details 135 false false R136.htm 1137 - Disclosure - Summary of Range of Exercise Prices of Options Outstanding (Parenthetical) (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfRangeOfExercisePricesOfOptionsOutstandingParenthetical Summary of Range of Exercise Prices of Options Outstanding (Parenthetical) (Detail) Details 136 false false R137.htm 1138 - Disclosure - Summary of Restricted Stock Grants Since Inception (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfRestrictedStockGrantsSinceInception Summary of Restricted Stock Grants Since Inception (Detail) Details 137 false false R138.htm 1139 - Disclosure - Summary of Non-Vested Restricted Shares Activity (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfNonVestedRestrictedSharesActivity Summary of Non-Vested Restricted Shares Activity (Detail) Details 138 false false R139.htm 1140 - Disclosure - 401(k) Plan - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/Disclosure401kPlanAdditionalInformation 401(k) Plan - Additional Information (Detail) Details 139 false false R140.htm 1141 - Disclosure - Computation of Basic and Diluted Earnings Per Share (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureComputationOfBasicAndDilutedEarningsPerShare Computation of Basic and Diluted Earnings Per Share (Detail) Details 140 false false R141.htm 1142 - Disclosure - Reconciliation of Weighted Average Shares for Basic and Diluted Earnings Per Share (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureReconciliationOfWeightedAverageSharesForBasicAndDilutedEarningsPerShare Reconciliation of Weighted Average Shares for Basic and Diluted Earnings Per Share (Detail) Details 141 false false R142.htm 1143 - Disclosure - Earnings Per Share - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureEarningsPerShareAdditionalInformation Earnings Per Share - Additional Information (Detail) Details 142 false false R143.htm 1144 - Disclosure - Summarizes Options which Deemed to be Anti-dilutive (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummarizesOptionsWhichDeemedToBeAntidilutive Summarizes Options which Deemed to be Anti-dilutive (Detail) Details 143 false false R144.htm 1145 - Disclosure - Statutory Financial Information - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureStatutoryFinancialInformationAdditionalInformation Statutory Financial Information - Additional Information (Detail) Details 144 false false R145.htm 1146 - Disclosure - Information for Company's United States Insurance Companies, Net of Intercompany Eliminations as Determined in Accordance With Sap (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureInformationForCompanysUnitedStatesInsuranceCompaniesNetOfIntercompanyEliminationsAsDeterminedInAccordanceWithSap Information for Company's United States Insurance Companies, Net of Intercompany Eliminations as Determined in Accordance With Sap (Detail) Details 145 false false R146.htm 1147 - Disclosure - Information for United States Insurance Companies & Global Indemnity Reinsurance, Net of Intercompany Eliminations, as Determined in Accordance With SAP and Bermuda (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureInformationForUnitedStatesInsuranceCompaniesGlobalIndemnityReinsuranceNetOfIntercompanyEliminationsAsDeterminedInAccordanceWithSAPAndBermuda Information for United States Insurance Companies & Global Indemnity Reinsurance, Net of Intercompany Eliminations, as Determined in Accordance With SAP and Bermuda (Detail) Details 146 false false R147.htm 1148 - Disclosure - Segment Information - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSegmentInformationAdditionalInformation Segment Information - Additional Information (Detail) Details 147 false false R148.htm 1149 - Disclosure - Summary of Business Segment Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfBusinessSegmentInformation Summary of Business Segment Information (Detail) Details 148 false false R149.htm 1150 - Disclosure - Summary of Business Segment Information (Parenthetical) (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfBusinessSegmentInformationParenthetical Summary of Business Segment Information (Parenthetical) (Detail) Details 149 false false R150.htm 1151 - Disclosure - Net Federal Income Taxes and Cash Interest Paid (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureNetFederalIncomeTaxesAndCashInterestPaid Net Federal Income Taxes and Cash Interest Paid (Detail) Details 150 false false R151.htm 1152 - Disclosure - Supplemental Cash Flow Information - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSupplementalCashFlowInformationAdditionalInformation Supplemental Cash Flow Information - Additional Information (Detail) Details 151 false false R152.htm 1153 - Disclosure - Liabilities Assumed on Acquisition (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureLiabilitiesAssumedOnAcquisition Liabilities Assumed on Acquisition (Detail) Details 152 false false R153.htm 1154 - Disclosure - Summary of Quarterly Performance (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfQuarterlyPerformance Summary of Quarterly Performance (Detail) Details 153 false false R154.htm 1155 - Disclosure - Subsequent Event - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSubsequentEventAdditionalInformation Subsequent Event - Additional Information (Detail) Details 154 false false R155.htm 1156 - Disclosure - Summary Of Investments Other Than Investments In Related Parties (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSummaryOfInvestmentsOtherThanInvestmentsInRelatedParties Summary Of Investments Other Than Investments In Related Parties (Detail) Details 155 false false R156.htm 1157 - Disclosure - Condensed Financial Information of Registrant (Parent Only) Balance Sheets (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureCondensedFinancialInformationOfRegistrantParentOnlyBalanceSheets Condensed Financial Information of Registrant (Parent Only) Balance Sheets (Detail) Details http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsCondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock 156 false false R157.htm 1158 - Disclosure - Condensed Financial Information of Registrant (Parent Only) Balance Sheets (Parenthetical) (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureCondensedFinancialInformationOfRegistrantParentOnlyBalanceSheetsParenthetical Condensed Financial Information of Registrant (Parent Only) Balance Sheets (Parenthetical) (Detail) Details http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsCondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock 157 false false R158.htm 1159 - Disclosure - Condensed Financial Information of Registrant (Parent Only) Statement of Operations and Comprehensive Income (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureCondensedFinancialInformationOfRegistrantParentOnlyStatementOfOperationsAndComprehensiveIncome Condensed Financial Information of Registrant (Parent Only) Statement of Operations and Comprehensive Income (Detail) Details http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsCondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock 158 false false R159.htm 1160 - Disclosure - Condensed Financial Information of Registrant (Parent Only) Statement of Cash Flows (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureCondensedFinancialInformationOfRegistrantParentOnlyStatementOfCashFlows Condensed Financial Information of Registrant (Parent Only) Statement of Cash Flows (Detail) Details http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsCondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock 159 false false R160.htm 1161 - Disclosure - Condensed Financial Information of Registrant (Parent Only) - Additional Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureCondensedFinancialInformationOfRegistrantParentOnlyAdditionalInformation Condensed Financial Information of Registrant (Parent Only) - Additional Information (Detail) Details http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsCondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock 160 false false R161.htm 1162 - Disclosure - Supplementary Insurance Information (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSupplementaryInsuranceInformation Supplementary Insurance Information (Detail) Details http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsSupplementaryInsuranceInformationForInsuranceCompaniesDisclosureTextBlock 161 false false R162.htm 1163 - Disclosure - Supplementary Insurance Information Unallocated Corporate Items (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSupplementaryInsuranceInformationUnallocatedCorporateItems Supplementary Insurance Information Unallocated Corporate Items (Detail) Details 162 false false R163.htm 1164 - Disclosure - Reinsurance Earned Premiums (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureReinsuranceEarnedPremiums Reinsurance Earned Premiums (Detail) Details http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsSupplementalScheduleOfReinsurancePremiumsForInsuranceCompaniesTextBlock 163 false false R164.htm 1165 - Disclosure - Valuation and Qualifying Accounts and Reserves (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureValuationAndQualifyingAccountsAndReserves Valuation and Qualifying Accounts and Reserves (Detail) Details http://www.globalindemnity.ie/taxonomy/role/NotesToFinancialStatementsScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock 164 false false R165.htm 1166 - Disclosure - Supplementary Information for Property Casualty Underwriters (Detail) Sheet http://www.globalindemnity.ie/taxonomy/role/DisclosureSupplementaryInformationForPropertyCasualtyUnderwriters Supplementary Information for Property Casualty Underwriters (Detail) Details 165 false false All Reports Book All Reports gbli-20161231.xml gbli-20161231.xsd gbli-20161231_cal.xml gbli-20161231_def.xml gbli-20161231_lab.xml gbli-20161231_pre.xml true true