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Income Taxes - Schedule of Net Operating Losses for Tax Purpose - Non-U.S. (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Operating Loss Carryforwards [Line Items] |  |
December 31, 2014 | $ (15,737)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
March 31, 2015 | (15,737)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Foreign Subsidiaries [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
December 31, 2014 | (5,522)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = wetf_ForeignSubsidiariesMember | (4,061)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = wetf_ForeignSubsidiariesMember
Foreign subsidiaries loss | (1,461)wetf_DeferredTaxAssetsNetOperatingLoss / us-gaap_StatementGeographicalAxis = wetf_ForeignSubsidiariesMember |
March 31, 2015 | $ (5,522)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = wetf_ForeignSubsidiariesMember | $ (4,061)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = wetf_ForeignSubsidiariesMember

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 + Details
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