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Acquisition and Goodwill - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Apr. 15, 2014	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Remaining acquiree ownership percentage	25.00%wetf_PercentageOfRemainingAcquireeOwnershipInterestToBeAcquiredInFuture
Acquisition ownership percentage		88.00%wetf_PercentageOfOwnershipInterestHeldByMajorShareholdersPriorToAcquisition
Stock-based compensation expense		$ 2,344,000us-gaap_ShareBasedCompensation	$ 2,015,000us-gaap_ShareBasedCompensation
Goodwill		1,676,000us-gaap_Goodwill		1,676,000us-gaap_Goodwill
Chief Executive Officer [Member]
Business Acquisition [Line Items]
Stock-based compensation expense		6,000us-gaap_ShareBasedCompensation / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Non-Employee Shareholders [Member]
Business Acquisition [Line Items]
Interest expense		251,000us-gaap_InterestExpense / us-gaap_TitleOfIndividualAxis = wetf_NonEmployeeShareholdersMember
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
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
Percentage of minority shareholder's		12.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / 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

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Business combination minimum guaranteed payment on termination of employment.

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Number Of Shareholders

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Percentage of ownership interest held by two major shareholders prior to acquisition.

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Percentage of remaining acquiree ownership interest to be acquired in future.

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