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Exit Activities - Schedule of Operating Losses (Parenthetical) (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
WisdomTree Japan Inc. ("WTJ") [Member] |
Lease Impairment Charges | $ 572

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- Definition Lease Impairment charges. + References No definition available. + Details
Name: | wetf_LeaseImpairmentCharges
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=wetf_WisdomtreeJapanIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |