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Significant Accounting Policies - Revenues and Expenses under Collaborative Arrangement (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Related Party Transaction [Line Items] |  |  |
ETF advisory fee revenue | $ 182,816us-gaap_InvestmentAdvisoryFees | $ 148,594us-gaap_InvestmentAdvisoryFees | $ 84,024us-gaap_InvestmentAdvisoryFees
Expenses: |  |  |
Marketing and advertising | 11,514us-gaap_MarketingAndAdvertisingExpense | 8,309us-gaap_MarketingAndAdvertisingExpense | 5,363us-gaap_MarketingAndAdvertisingExpense
Sales and business development | 6,221us-gaap_BusinessDevelopment | 6,474us-gaap_BusinessDevelopment | 3,586us-gaap_BusinessDevelopment
Total expenses | 110,214us-gaap_OperatingExpenses | 97,931us-gaap_OperatingExpenses | 73,768us-gaap_OperatingExpenses
Net income | 61,051us-gaap_NetIncomeLoss | 51,537us-gaap_NetIncomeLoss | 11,030us-gaap_NetIncomeLoss
Third-Party Sharing Arrangements [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
ETF advisory fee revenue |  |  | 10,968us-gaap_InvestmentAdvisoryFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wetf_ThirdPartySharingArrangementsMember
Expenses: |  |  |
Fund management and administration |  |  | 1,341wetf_FundManagementAndAdministration / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wetf_ThirdPartySharingArrangementsMember
Marketing and advertising |  |  | 39us-gaap_MarketingAndAdvertisingExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wetf_ThirdPartySharingArrangementsMember
Sales and business development |  |  | 24us-gaap_BusinessDevelopment / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wetf_ThirdPartySharingArrangementsMember
Total expenses |  |  | 1,404us-gaap_OperatingExpenses / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wetf_ThirdPartySharingArrangementsMember
Net income |  |  | 9,564us-gaap_NetIncomeLoss / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wetf_ThirdPartySharingArrangementsMember
Sharing |  |  | $ 4,662wetf_ProfitSharing / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wetf_ThirdPartySharingArrangementsMember

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- Definition Business development involves the development of products and services, their delivery, design and their implementation. Business development includes a number of techniques designed to grow an economic enterprise. Such techniques include, but are not limited to, assessments of marketing opportunities and target markets, intelligence gathering on customers and competitors, generating leads for possible sales, follow-up sales activity, formal proposal writing and business model design. Business development involves evaluating a business and then realizing its full potential, using such tools as marketing, sales, information management and customer service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.6) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of fees earned from providing investment advice and research to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. + References No definition available. + Details
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