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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 |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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