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Income Taxes - Schedule of Net Operating Losses for Tax Purpose (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
December 31, 2014	$ (109,839)us-gaap_OperatingLossCarryforwards
U.S. GAAP pretax income	22,481us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
State income taxes	(350)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Income tax differences:
Temporary	(7,940)wetf_TemporaryTaxDifferences
Permanent	(46,143)wetf_PermanentTaxDifferences
March 31, 2015	$ (141,791)us-gaap_OperatingLossCarryforwards

X

- Definition

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing 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))

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I.7)

-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817



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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section I

-Subsection 7



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Deferred Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6510177



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

+ Details

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Period Type:	duration

X

- Details

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Period Type:	duration

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

+ Details

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Balance Type:	debit
Period Type:	instant

X

- 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.

+ Details

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- Details

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X

- 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.

+ Details

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Balance Type:	debit
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