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Income Taxes - Schedule of Net Operating Losses for Tax Purposes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Beginning NOL	$ (140,959)us-gaap_OperatingLossCarryforwards	$ (136,515)us-gaap_OperatingLossCarryforwards	$ (106,939)us-gaap_OperatingLossCarryforwards
U.S. GAAP income	77,609us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	51,537us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	11,030us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Tax differences:
Temporary	(1,425)wetf_TemporaryTaxDifferences	5,580wetf_TemporaryTaxDifferences	(5,633)wetf_TemporaryTaxDifferences
Permanent	(45,064)wetf_PermanentTaxDifferences	(61,561)wetf_PermanentTaxDifferences	(37,618)wetf_PermanentTaxDifferences
Net operating losses expired			2,645wetf_NetOperatingLossesExpired
Ending NOL	$ (109,839)us-gaap_OperatingLossCarryforwards	$ (140,959)us-gaap_OperatingLossCarryforwards	$ (136,515)us-gaap_OperatingLossCarryforwards

X

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

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- Definition

Net Operating Losses Expired

+ References

No definition available.

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- Definition

Permanent differences are primarily comprised of the difference between stock based compensation amounts recognized for tax purposes at the time options are exercised (at the intrinsic value) or restricted stock is vested (at fair value of the share price) and previously expensed at the date of grant for US GAAP purposes at then recorded fair values.

+ References

No definition available.

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- Definition

Temporary differences are primarily comprised of the difference between recognizing expenses for tax purposes associated with rent, compensation and depreciation of fixed assets and US GAAP purposes.

+ References

No definition available.

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