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Stock-Based Awards - Summary of Stock-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 8,137us-gaap_ShareBasedCompensation	$ 6,459us-gaap_ShareBasedCompensation	$ 7,437us-gaap_ShareBasedCompensation
Employees and Directors Option Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	487us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = wetf_EmployeesAndDirectorsStockOptionsMember	381us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = wetf_EmployeesAndDirectorsStockOptionsMember	1,436us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = wetf_EmployeesAndDirectorsStockOptionsMember
Employees and Directors Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	7,650us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = wetf_EmployeesAndDirectorsRestrictedStockAwardsMember	6,078us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = wetf_EmployeesAndDirectorsRestrictedStockAwardsMember	3,814us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = wetf_EmployeesAndDirectorsRestrictedStockAwardsMember
Nonemployee Consultants and Special Advisers Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 2,187us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = wetf_NonemployeeConsultantsAndSpecialAdvisorsRestrictedStockAwardsMember

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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- Details

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- Details

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- Details

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