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AdvisorEngine - Financial Interests - Additional Information (Detail) - Advisor Engine [Member] $ in Thousands | 3 Months Ended
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Mar. 31, 2020 USD ($)
Estimated Fair Value of Consideration Payable to WisdomTree | $ 8,500
Maximum Amount of Contingent Payments That May be Received | 11,500
Variable Interest Entity Nonconsolidated Carrying Amount Assets Impairment | $ 19,672

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- Definition Estimated fair value of consideration payable to WisdomTree. + References No definition available. + Details
Name: | wetf_EstimatedFairValueOfConsiderationPayableToWisdomtree
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum amount of contingent payments that may be received. + References No definition available. + Details
Name: | wetf_MaximumAmountOfContingentPaymentsThatMayBeReceived
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Impairment of AdvisorEngine financial interests + References No definition available. + Details
Name: | wetf_VariableInterestEntityNonconsolidatedCarryingAmountAssetsImpairment
Namespace Prefix: | wetf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=wetf_AdvisorEngineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |