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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

X

- 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

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-Topic 225

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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

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X

- 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

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-Name Accounting Standards Codification

-Topic 225

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-Subparagraph (SX 210.5-03.4)

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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

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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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.

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- Definition

Fund management and administration.

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- Definition

Profit sharing.

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No definition available.

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