3.10.0.1 html 282 477 1 false 101 0 false 10 false false R1.htm 1001 - Document - Document And Entity Information Sheet http://www.wisdomtreeinvestmentsinc.com/role/DocumentAndEntityInformation Document And Entity Information Cover 1 false false R2.htm 1002 - Statement - Consolidated Balance Sheets Sheet http://www.wisdomtreeinvestmentsinc.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 1003 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.wisdomtreeinvestmentsinc.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 1004 - Statement - Consolidated Statements of Operations Sheet http://www.wisdomtreeinvestmentsinc.com/role/ConsolidatedStatementsOfOperations Consolidated Statements of Operations Statements 4 false false R5.htm 1005 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.wisdomtreeinvestmentsinc.com/role/ConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 5 false false R6.htm 1006 - Statement - Consolidated Statements of Changes in Stockholders' Equity Sheet http://www.wisdomtreeinvestmentsinc.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity Consolidated Statements of Changes in Stockholders' Equity Statements 6 false false R7.htm 1007 - Statement - Consolidated Statements of Cash Flows Sheet http://www.wisdomtreeinvestmentsinc.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 7 false false R8.htm 1008 - Statement - Consolidated Statements of Cash Flows (Parenthetical) Sheet http://www.wisdomtreeinvestmentsinc.com/role/ConsolidatedStatementsOfCashFlowsParenthetical Consolidated Statements of Cash Flows (Parenthetical) Statements 8 false false R9.htm 1009 - Disclosure - Organization and Description of Business Sheet http://www.wisdomtreeinvestmentsinc.com/role/OrganizationAndDescriptionOfBusiness Organization and Description of Business Notes 9 false false R10.htm 1010 - Disclosure - Significant Accounting Policies Sheet http://www.wisdomtreeinvestmentsinc.com/role/SignificantAccountingPolicies Significant Accounting Policies Notes 10 false false R11.htm 1011 - Disclosure - Business Combination Sheet http://www.wisdomtreeinvestmentsinc.com/role/BusinessCombination Business Combination Notes 11 false false R12.htm 1012 - Disclosure - Cash and Cash Equivalents Sheet http://www.wisdomtreeinvestmentsinc.com/role/CashAndCashEquivalents Cash and Cash Equivalents Notes 12 false false R13.htm 1013 - Disclosure - Fair Value Measurements Sheet http://www.wisdomtreeinvestmentsinc.com/role/FairValueMeasurements Fair Value Measurements Notes 13 false false R14.htm 1014 - Disclosure - Securities Owned/Sold but Not Yet Purchased Sheet http://www.wisdomtreeinvestmentsinc.com/role/SecuritiesOwnedSoldButNotYetPurchased Securities Owned/Sold but Not Yet Purchased Notes 14 false false R15.htm 1015 - Disclosure - Securities Held-to-Maturity Sheet http://www.wisdomtreeinvestmentsinc.com/role/SecuritiesHeldToMaturity Securities Held-to-Maturity Notes 15 false false R16.htm 1016 - Disclosure - Note Receivable Sheet http://www.wisdomtreeinvestmentsinc.com/role/NoteReceivable Note Receivable Notes 16 false false R17.htm 1017 - Disclosure - Investments, Carried at Cost Sheet http://www.wisdomtreeinvestmentsinc.com/role/InvestmentsCarriedAtCost Investments, Carried at Cost Notes 17 false false R18.htm 1018 - Disclosure - Fixed Assets, net Sheet http://www.wisdomtreeinvestmentsinc.com/role/FixedAssetsNet Fixed Assets, net Notes 18 false false R19.htm 1019 - Disclosure - Deferred Consideration Sheet http://www.wisdomtreeinvestmentsinc.com/role/DeferredConsideration Deferred Consideration Notes 19 false false R20.htm 1020 - Disclosure - Long-Term Debt Sheet http://www.wisdomtreeinvestmentsinc.com/role/LongTermDebt Long-Term Debt Notes 20 false false R21.htm 1021 - Disclosure - Preferred Shares Sheet http://www.wisdomtreeinvestmentsinc.com/role/PreferredShares Preferred Shares Notes 21 false false R22.htm 1022 - Disclosure - Commitments and Contingencies Sheet http://www.wisdomtreeinvestmentsinc.com/role/CommitmentsAndContingencies Commitments and Contingencies Notes 22 false false R23.htm 1023 - Disclosure - Variable Interest Entity Sheet http://www.wisdomtreeinvestmentsinc.com/role/VariableInterestEntity Variable Interest Entity Notes 23 false false R24.htm 1024 - Disclosure - Acquisition Payment Expense—Boost ETP, LLP Sheet http://www.wisdomtreeinvestmentsinc.com/role/AcquisitionPaymentExpenseBoostEtpLlp Acquisition Payment Expense—Boost ETP, LLP Notes 24 false false R25.htm 1025 - Disclosure - Revenues from Contracts with Customers Sheet http://www.wisdomtreeinvestmentsinc.com/role/RevenuesFromContractsWithCustomers Revenues from Contracts with Customers Notes 25 false false R26.htm 1026 - Disclosure - Related Party Transactions Sheet http://www.wisdomtreeinvestmentsinc.com/role/RelatedPartyTransactions Related Party Transactions Notes 26 false false R27.htm 1027 - Disclosure - Stock-Based Awards Sheet http://www.wisdomtreeinvestmentsinc.com/role/StockBasedAwards Stock-Based Awards Notes 27 false false R28.htm 1028 - Disclosure - Employee Benefit Plans Sheet http://www.wisdomtreeinvestmentsinc.com/role/EmployeeBenefitPlans Employee Benefit Plans Notes 28 false false R29.htm 1029 - Disclosure - Earnings Per Share Sheet http://www.wisdomtreeinvestmentsinc.com/role/EarningsPerShare Earnings Per Share Notes 29 false false R30.htm 1030 - Disclosure - Income Taxes Sheet http://www.wisdomtreeinvestmentsinc.com/role/IncomeTaxes Income Taxes Notes 30 false false R31.htm 1031 - Disclosure - Shares Repurchased Sheet http://www.wisdomtreeinvestmentsinc.com/role/SharesRepurchased Shares Repurchased Notes 31 false false R32.htm 1032 - Disclosure - Goodwill and Intangible Assets Sheet http://www.wisdomtreeinvestmentsinc.com/role/GoodwillAndIntangibleAssets Goodwill and Intangible Assets Notes 32 false false R33.htm 1033 - Disclosure - Impairments Sheet http://www.wisdomtreeinvestmentsinc.com/role/Impairments Impairments Notes 33 false false R34.htm 1034 - Disclosure - Segment Reporting Sheet http://www.wisdomtreeinvestmentsinc.com/role/SegmentReporting Segment Reporting Notes 34 false false R35.htm 1035 - Disclosure - Subsequent Events Sheet http://www.wisdomtreeinvestmentsinc.com/role/SubsequentEvents Subsequent Events Notes 35 false false R36.htm 1036 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SignificantAccountingPoliciesPolicies Significant Accounting Policies (Policies) Policies http://www.wisdomtreeinvestmentsinc.com/role/SignificantAccountingPolicies 36 false false R37.htm 1037 - Disclosure - Significant Accounting Policies (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SignificantAccountingPoliciesTables Significant Accounting Policies (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/SignificantAccountingPolicies 37 false false R38.htm 1038 - Disclosure - Business Combination (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/BusinessCombinationTables Business Combination (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/BusinessCombination 38 false false R39.htm 1039 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/FairValueMeasurements 39 false false R40.htm 1040 - Disclosure - Securities Owned/Sold but Not Yet Purchased (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SecuritiesOwnedSoldButNotYetPurchasedTables Securities Owned/Sold but Not Yet Purchased (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/SecuritiesOwnedSoldButNotYetPurchased 40 false false R41.htm 1041 - Disclosure - Securities Held-to-Maturity (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SecuritiesHeldToMaturityTables Securities Held-to-Maturity (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/SecuritiesHeldToMaturity 41 false false R42.htm 1042 - Disclosure - Note Receivable (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/NoteReceivableTables Note Receivable (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/NoteReceivable 42 false false R43.htm 1043 - Disclosure - Investments, Carried at Cost (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/InvestmentsCarriedAtCostTables Investments, Carried at Cost (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/InvestmentsCarriedAtCost 43 false false R44.htm 1044 - Disclosure - Fixed Assets, net (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/FixedAssetsNetTables Fixed Assets, net (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/FixedAssetsNet 44 false false R45.htm 1045 - Disclosure - Long-Term Debt (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/LongTermDebtTables Long-Term Debt (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/LongTermDebt 45 false false R46.htm 1046 - Disclosure - Preferred Shares (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/PreferredSharesTables Preferred Shares (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/PreferredShares 46 false false R47.htm 1047 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/CommitmentsAndContingenciesTables Commitments and Contingencies (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/CommitmentsAndContingencies 47 false false R48.htm 1048 - Disclosure - Variable Interest Entity (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/VariableInterestEntityTables Variable Interest Entity (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/VariableInterestEntity 48 false false R49.htm 1049 - Disclosure - Revenues from Contracts with Customers (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/RevenuesFromContractsWithCustomersTables Revenues from Contracts with Customers (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/RevenuesFromContractsWithCustomers 49 false false R50.htm 1050 - Disclosure - Related Party Transactions (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/RelatedPartyTransactionsTables Related Party Transactions (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/RelatedPartyTransactions 50 false false R51.htm 1051 - Disclosure - Stock-Based Awards (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/StockBasedAwardsTables Stock-Based Awards (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/StockBasedAwards 51 false false R52.htm 1052 - Disclosure - Employee Benefit Plans (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/EmployeeBenefitPlansTables Employee Benefit Plans (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/EmployeeBenefitPlans 52 false false R53.htm 1053 - Disclosure - Earnings Per Share (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/EarningsPerShare 53 false false R54.htm 1054 - Disclosure - Income Taxes (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/IncomeTaxes 54 false false R55.htm 1055 - Disclosure - Goodwill and Intangible Assets (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/GoodwillAndIntangibleAssetsTables Goodwill and Intangible Assets (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/GoodwillAndIntangibleAssets 55 false false R56.htm 1056 - Disclosure - Impairments (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/ImpairmentsTables Impairments (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/Impairments 56 false false R57.htm 1057 - Disclosure - Segment Reporting (Tables) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SegmentReportingTables Segment Reporting (Tables) Tables http://www.wisdomtreeinvestmentsinc.com/role/SegmentReporting 57 false false R58.htm 1058 - Disclosure - Organizational and Description of Business - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/OrganizationalAndDescriptionOfBusinessAdditionalInformationDetail Organizational and Description of Business - Additional Information (Detail) Details 58 false false R59.htm 1059 - Disclosure - Significant Accounting Policies - Summary of Reclassifications to Conform to the Current Year's Consolidated Financial Statement Presentation (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SignificantAccountingPoliciesSummaryOfReclassificationsToConformToTheCurrentYearsConsolidatedFinancialStatementPresentationDetail Significant Accounting Policies - Summary of Reclassifications to Conform to the Current Year's Consolidated Financial Statement Presentation (Detail) Details 59 false false R60.htm 1060 - Disclosure - Significant Accounting Policies - Schedule of Estimated Useful Lives of Related Assets (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SignificantAccountingPoliciesScheduleOfEstimatedUsefulLivesOfRelatedAssetsDetail Significant Accounting Policies - Schedule of Estimated Useful Lives of Related Assets (Detail) Details 60 false false R61.htm 1061 - Disclosure - Significant Accounting Policies - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SignificantAccountingPoliciesAdditionalInformationDetail Significant Accounting Policies - Additional Information (Detail) Details 61 false false R62.htm 1062 - Disclosure - Business Combination - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/BusinessCombinationAdditionalInformationDetail Business Combination - Additional Information (Detail) Details 62 false false R63.htm 1063 - Disclosure - Business Combination - Summary of Allocation of Purchase Price (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/BusinessCombinationSummaryOfAllocationOfPurchasePriceDetail Business Combination - Summary of Allocation of Purchase Price (Detail) Details 63 false false R64.htm 1064 - Disclosure - Business Combination - Summary of Fair Value of Intangible Assets (Parenthetical) (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/BusinessCombinationSummaryOfFairValueOfIntangibleAssetsParentheticalDetail Business Combination - Summary of Fair Value of Intangible Assets (Parenthetical) (Detail) Details 64 false false R65.htm 1065 - Disclosure - Business Combination - Summary of Operating Results of ETFS since the Acquisition Date (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/BusinessCombinationSummaryOfOperatingResultsOfEtfsSinceTheAcquisitionDateDetail Business Combination - Summary of Operating Results of ETFS since the Acquisition Date (Detail) Details 65 false false R66.htm 1066 - Disclosure - Business Combination - Summary of Pro Forma Financial Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/BusinessCombinationSummaryOfProFormaFinancialInformationDetail Business Combination - Summary of Pro Forma Financial Information (Detail) Details 66 false false R67.htm 1067 - Disclosure - Cash and Cash Equivalents - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/CashAndCashEquivalentsAdditionalInformationDetail Cash and Cash Equivalents - Additional Information (Detail) Details 67 false false R68.htm 1068 - Disclosure - Fair Value Measurements - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/FairValueMeasurementsAdditionalInformationDetail Fair Value Measurements - Additional Information (Detail) Details 68 false false R69.htm 1069 - Disclosure - Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/FairValueMeasurementsSummaryOfCategorizationOfAssetsAndLiabilitiesMeasuredAtFairValueDetail Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) Details 69 false false R70.htm 1070 - Disclosure - Fair Value Measurements - Summary of Reconciliation of Recurring Fair Value Measurements (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/FairValueMeasurementsSummaryOfReconciliationOfRecurringFairValueMeasurementsDetail Fair Value Measurements - Summary of Reconciliation of Recurring Fair Value Measurements (Detail) Details 70 false false R71.htm 1071 - Disclosure - Securities Owned/Sold but Not Yet Purchased - Schedule of Securities Owned/Sold But Not Yet Purchased (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SecuritiesOwnedSoldButNotYetPurchasedScheduleOfSecuritiesOwnedSoldButNotYetPurchasedDetail Securities Owned/Sold but Not Yet Purchased - Schedule of Securities Owned/Sold But Not Yet Purchased (Detail) Details 71 false false R72.htm 1072 - Disclosure - Securities Owned/Sold but Not Yet Purchased - Schedule of Unrealized Gains, Losses and Fair Value of AFS Debt Securities (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SecuritiesOwnedSoldButNotYetPurchasedScheduleOfUnrealizedGainsLossesAndFairValueOfAfsDebtSecuritiesDetail Securities Owned/Sold but Not Yet Purchased - Schedule of Unrealized Gains, Losses and Fair Value of AFS Debt Securities (Detail) Details 72 false false R73.htm 1073 - Disclosure - Securities Owned/Sold but Not Yet Purchased - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SecuritiesOwnedSoldButNotYetPurchasedAdditionalInformationDetail Securities Owned/Sold but Not Yet Purchased - Additional Information (Detail) Details 73 false false R74.htm 1074 - Disclosure - Securities Held-to-Maturity - Schedule of Securities Held-to-Maturity (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SecuritiesHeldToMaturityScheduleOfSecuritiesHeldToMaturityDetail Securities Held-to-Maturity - Schedule of Securities Held-to-Maturity (Detail) Details 74 false false R75.htm 1075 - Disclosure - Securities Held-to-Maturity - Schedule of Unrealized Gains, Losses and Fair Value of Securities Held-to-Maturity (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SecuritiesHeldToMaturityScheduleOfUnrealizedGainsLossesAndFairValueOfSecuritiesHeldToMaturityDetail Securities Held-to-Maturity - Schedule of Unrealized Gains, Losses and Fair Value of Securities Held-to-Maturity (Detail) Details 75 false false R76.htm 1076 - Disclosure - Securities Held-to-Maturity - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SecuritiesHeldToMaturityAdditionalInformationDetail Securities Held-to-Maturity - Additional Information (Detail) Details 76 false false R77.htm 1077 - Disclosure - Securities Held-to-Maturity - Schedule of Maturity Profile of Securities Held-to-Maturity (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SecuritiesHeldToMaturityScheduleOfMaturityProfileOfSecuritiesHeldToMaturityDetail Securities Held-to-Maturity - Schedule of Maturity Profile of Securities Held-to-Maturity (Detail) Details 77 false false R78.htm 1078 - Disclosure - Note Receivables - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/NoteReceivablesAdditionalInformationDetail Note Receivables - Additional Information (Detail) Details 78 false false R79.htm 1079 - Disclosure - Note Receivables - Summary of Outstanding Note Receivable Balance (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/NoteReceivablesSummaryOfOutstandingNoteReceivableBalanceDetail Note Receivables - Summary of Outstanding Note Receivable Balance (Detail) Details 79 false false R80.htm 1080 - Disclosure - Investments, Carried at Cost - Details of Investments Carried at Cost (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/InvestmentsCarriedAtCostDetailsOfInvestmentsCarriedAtCostDetail Investments, Carried at Cost - Details of Investments Carried at Cost (Detail) Details 80 false false R81.htm 1081 - Disclosure - Investment, Carried at Cost - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/InvestmentCarriedAtCostAdditionalInformationDetail Investment, Carried at Cost - Additional Information (Detail) Details 81 false false R82.htm 1082 - Disclosure - Investment - Summary of Ranges and Weighted Averages of Significant Unobservable Inputs Used to Determine Enterprise Value (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/InvestmentSummaryOfRangesAndWeightedAveragesOfSignificantUnobservableInputsUsedToDetermineEnterpriseValueDetail Investment - Summary of Ranges and Weighted Averages of Significant Unobservable Inputs Used to Determine Enterprise Value (Detail) Details 82 false false R83.htm 1083 - Disclosure - Investment - Summary of Ranges and Weighted Averages of Significant Unobservable Inputs Used to Quantitative Assessments (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/InvestmentSummaryOfRangesAndWeightedAveragesOfSignificantUnobservableInputsUsedToQuantitativeAssessmentsDetail Investment - Summary of Ranges and Weighted Averages of Significant Unobservable Inputs Used to Quantitative Assessments (Detail) Details 83 false false R84.htm 1084 - Disclosure - Fixed Assets, net - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/FixedAssetsNetAdditionalInformationDetail Fixed Assets, net - Additional Information (Detail) Details 84 false false R85.htm 1085 - Disclosure - Fixed Assets, net - Schedule of Fixed Assets (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/FixedAssetsNetScheduleOfFixedAssetsDetail Fixed Assets, net - Schedule of Fixed Assets (Detail) Details 85 false false R86.htm 1086 - Disclosure - Deferred Consideration - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/DeferredConsiderationAdditionalInformationDetail Deferred Consideration - Additional Information (Detail) Details 86 false false R87.htm 1087 - Disclosure - Long-Term Debt - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/LongTermDebtAdditionalInformationDetail Long-Term Debt - Additional Information (Detail) Details 87 false false R88.htm 1088 - Disclosure - Long-Term Debt - Summary of Outstanding Borrowings under Credit Facility (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/LongTermDebtSummaryOfOutstandingBorrowingsUnderCreditFacilityDetail Long-Term Debt - Summary of Outstanding Borrowings under Credit Facility (Detail) Details 88 false false R89.htm 1089 - Disclosure - Long-Term Debt - Summary of Financial Covenant and Leverage Ratio (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/LongTermDebtSummaryOfFinancialCovenantAndLeverageRatioDetail Long-Term Debt - Summary of Financial Covenant and Leverage Ratio (Detail) Details 89 false false R90.htm 1090 - Disclosure - Preferred Shares - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/PreferredSharesAdditionalInformationDetail Preferred Shares - Additional Information (Detail) Details 90 false false R91.htm 1091 - Disclosure - Preferred Shares - Summary of Preferred Share Balance (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/PreferredSharesSummaryOfPreferredShareBalanceDetail Preferred Shares - Summary of Preferred Share Balance (Detail) Details 91 false false R92.htm 1092 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/CommitmentsAndContingenciesAdditionalInformationDetail Commitments and Contingencies - Additional Information (Detail) Details 92 false false R93.htm 1093 - Disclosure - Commitments and Contingencies - Schedule of Future Minimum Lease Payments (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/CommitmentsAndContingenciesScheduleOfFutureMinimumLeasePaymentsDetail Commitments and Contingencies - Schedule of Future Minimum Lease Payments (Detail) Details 93 false false R94.htm 1094 - Disclosure - Variable Interest Entity - Summary of Information about Variable Interests (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/VariableInterestEntitySummaryOfInformationAboutVariableInterestsDetail Variable Interest Entity - Summary of Information about Variable Interests (Detail) Details 94 false false R95.htm 1095 - Disclosure - Acquisition Payment Expense - Boost ETP, LLP (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/AcquisitionPaymentExpenseBoostEtpLlpDetail Acquisition Payment Expense - Boost ETP, LLP (Detail) Details 95 false false R96.htm 1096 - Disclosure - Revenues from Contracts with Customers - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/RevenuesFromContractsWithCustomersAdditionalInformationDetail Revenues from Contracts with Customers - Additional Information (Detail) Details 96 false false R97.htm 1097 - Disclosure - Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/RevenuesFromContractsWithCustomersSummaryOfRevenuesFromContractsWithCustomersDetail Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers (Detail) Details 97 false false R98.htm 1098 - Disclosure - Related Party Transactions - Summary of Accounts Receivable from Related Parties (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/RelatedPartyTransactionsSummaryOfAccountsReceivableFromRelatedPartiesDetail Related Party Transactions - Summary of Accounts Receivable from Related Parties (Detail) Details 98 false false R99.htm 1099 - Disclosure - Related Party Transactions - Summary of Revenues from Advisory Services Provided to Related Parties (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/RelatedPartyTransactionsSummaryOfRevenuesFromAdvisoryServicesProvidedToRelatedPartiesDetail Related Party Transactions - Summary of Revenues from Advisory Services Provided to Related Parties (Detail) Details 99 false false R100.htm 1100 - Disclosure - Related Party Transactions - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/RelatedPartyTransactionsAdditionalInformationDetail Related Party Transactions - Additional Information (Detail) Details 100 false false R101.htm 1101 - Disclosure - Stock-Based Awards - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/StockBasedAwardsAdditionalInformationDetail Stock-Based Awards - Additional Information (Detail) Details 101 false false R102.htm 1102 - Disclosure - Stock-Based Awards - Summary of Unrecognized Stock-Based Compensation Expense and Average Remaining Vesting Period (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/StockBasedAwardsSummaryOfUnrecognizedStockBasedCompensationExpenseAndAverageRemainingVestingPeriodDetail Stock-Based Awards - Summary of Unrecognized Stock-Based Compensation Expense and Average Remaining Vesting Period (Detail) Details 102 false false R103.htm 1103 - Disclosure - Stock-Based Awards - Summary of Option Activity (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/StockBasedAwardsSummaryOfOptionActivityDetail Stock-Based Awards - Summary of Option Activity (Detail) Details 103 false false R104.htm 1104 - Disclosure - Stock-Based Awards - Summary of Option Activity (Parenthetical) (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/StockBasedAwardsSummaryOfOptionActivityParentheticalDetail Stock-Based Awards - Summary of Option Activity (Parenthetical) (Detail) Details 104 false false R105.htm 1105 - Disclosure - Stock-Based Awards - Summary of Information on Stock Options Outstanding and Exercisable (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/StockBasedAwardsSummaryOfInformationOnStockOptionsOutstandingAndExercisableDetail Stock-Based Awards - Summary of Information on Stock Options Outstanding and Exercisable (Detail) Details 105 false false R106.htm 1106 - Disclosure - Stock-Based Awards - Summary of Restricted Stock Activity (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/StockBasedAwardsSummaryOfRestrictedStockActivityDetail Stock-Based Awards - Summary of Restricted Stock Activity (Detail) Details 106 false false R107.htm 1107 - Disclosure - Employee Benefit Plans - Summary of Discretionary Contributions (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/EmployeeBenefitPlansSummaryOfDiscretionaryContributionsDetail Employee Benefit Plans - Summary of Discretionary Contributions (Detail) Details 107 false false R108.htm 1108 - Disclosure - Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/EarningsPerShareReconciliationOfBasicAndDilutedEarningsPerShareDetail Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) Details 108 false false R109.htm 1109 - Disclosure - Earnings Per Share - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/EarningsPerShareAdditionalInformationDetail Earnings Per Share - Additional Information (Detail) Details 109 false false R110.htm 1110 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/IncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 110 false false R111.htm 1111 - Disclosure - Income Taxes U.S. and foreign components of income before income tax expense (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/IncomeTaxesUSAndForeignComponentsOfIncomeBeforeIncomeTaxExpenseDetail Income Taxes U.S. and foreign components of income before income tax expense (Detail) Details 111 false false R112.htm 1112 - Disclosure - Income Taxes - Components of Current and Deferred Income Tax Expense (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/IncomeTaxesComponentsOfCurrentAndDeferredIncomeTaxExpenseDetail Income Taxes - Components of Current and Deferred Income Tax Expense (Detail) Details 112 false false R113.htm 1113 - Disclosure - Income Taxes - Reconciliation of Statutory Federal Income Tax Rate and Company's Effective Rate (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/IncomeTaxesReconciliationOfStatutoryFederalIncomeTaxRateAndCompanysEffectiveRateDetail Income Taxes - Reconciliation of Statutory Federal Income Tax Rate and Company's Effective Rate (Detail) Details 113 false false R114.htm 1114 - Disclosure - Income Taxes - Summary of Deferred Tax Assets (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/IncomeTaxesSummaryOfDeferredTaxAssetsDetail Income Taxes - Summary of Deferred Tax Assets (Detail) Details 114 false false R115.htm 1115 - Disclosure - Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/IncomeTaxesScheduleOfChangesInBalanceOfGrossUnrecognizedTaxBenefitsDetail Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) Details 115 false false R116.htm 1116 - Disclosure - Shares Repurchased - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SharesRepurchasedAdditionalInformationDetail Shares Repurchased - Additional Information (Detail) Details 116 false false R117.htm 1117 - Disclosure - Goodwill and Intangible Assets - Summary of Goodwill by Reporting Unit (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/GoodwillAndIntangibleAssetsSummaryOfGoodwillByReportingUnitDetail Goodwill and Intangible Assets - Summary of Goodwill by Reporting Unit (Detail) Details 117 false false R118.htm 1118 - Disclosure - Goodwill and Intangible Assets - Additional Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/GoodwillAndIntangibleAssetsAdditionalInformationDetail Goodwill and Intangible Assets - Additional Information (Detail) Details 118 false false R119.htm 1119 - Disclosure - Goodwill and Intangible Assets - Summary of Indefinite-lived Intangible Assets (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/GoodwillAndIntangibleAssetsSummaryOfIndefiniteLivedIntangibleAssetsDetail Goodwill and Intangible Assets - Summary of Indefinite-lived Intangible Assets (Detail) Details 119 false false R120.htm 1120 - Disclosure - Impairments (Details) Sheet http://www.wisdomtreeinvestmentsinc.com/role/ImpairmentsDetails Impairments (Details) Details http://www.wisdomtreeinvestmentsinc.com/role/ImpairmentsTables 120 false false R121.htm 1121 - Disclosure - Segment Reporting - Reportable Segment Information (Detail) Sheet http://www.wisdomtreeinvestmentsinc.com/role/SegmentReportingReportableSegmentInformationDetail Segment Reporting - Reportable Segment Information (Detail) Details 121 false false All Reports Book All Reports wetf-20181231.xml wetf-20181231.xsd wetf-20181231_cal.xml wetf-20181231_def.xml wetf-20181231_lab.xml wetf-20181231_pre.xml http://fasb.org/us-gaap/2018-01-31 http://fasb.org/srt/2018-01-31 http://xbrl.sec.gov/invest/2013-01-31 http://xbrl.sec.gov/dei/2018-01-31 true true