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Acquisition and Goodwill - Additional Information (Detail) (USD $)
0 Months Ended 12 Months Ended
Apr. 15, 2014
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Remaining acquiree ownership percentage 25.00%wetf_PercentageOfRemainingAcquireeOwnershipInterestToBeAcquiredInFuture    
Acquisition ownership percentage   88.00%wetf_PercentageOfOwnershipInterestHeldByMajorShareholdersPriorToAcquisition  
Goodwill   $ 1,676,000us-gaap_Goodwill   
WisdomTree Europe [Member]      
Business Acquisition [Line Items]      
Acquisition ownership percentage 75.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= wetf_WisdomtreeEuropeEntityMember
   
Time period over percentage change of ownership occur 4 years    
Business acquisition consideration transferred 0us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= wetf_WisdomtreeEuropeEntityMember
   
Payout description   The ultimate payout will be made in cash over two years.  
Payout period 2 years    
Acquisition transaction cost   1,607,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= wetf_WisdomtreeEuropeEntityMember
 
WisdomTree Europe [Member] | Chief Executive Officer [Member]      
Business Acquisition [Line Items]      
Guaranteed minimum payment   1,757,000wetf_BusinessCombinationMinimumGuaranteedPaymentOnTerminationOfEmployment
/ us-gaap_BusinessAcquisitionAxis
= wetf_WisdomtreeEuropeEntityMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
 
Boost Shareholders [Member]      
Business Acquisition [Line Items]      
Number of shareholders   2wetf_NumberOfShareholders
/ dei_LegalEntityAxis
= wetf_BoostShareholdersMember
 
Redeemable noncontrolling interest, ownership percentage by noncontrolling owners   25.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= wetf_BoostShareholdersMember
 
Goodwill   1,676,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= wetf_BoostShareholdersMember
 
Purchase price   1,757,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ dei_LegalEntityAxis
= wetf_BoostShareholdersMember
 
Boost Shareholders [Member] | Fair Value [Member]      
Business Acquisition [Line Items]      
Fair value of net assets acquired   $ 81,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= wetf_BoostShareholdersMember