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Income Taxes - Schedule of Net Operating Losses for Tax Purpose - Non-U.S. (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
December 31, 2014	$ (15,737)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
March 31, 2015	(15,737)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Foreign Subsidiaries [Member]
Operating Loss Carryforwards [Line Items]
December 31, 2014	(5,522)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = wetf_ForeignSubsidiariesMember	(4,061)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = wetf_ForeignSubsidiariesMember
Foreign subsidiaries loss	(1,461)wetf_DeferredTaxAssetsNetOperatingLoss / us-gaap_StatementGeographicalAxis = wetf_ForeignSubsidiariesMember
March 31, 2015	$ (5,522)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = wetf_ForeignSubsidiariesMember	$ (4,061)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_StatementGeographicalAxis = wetf_ForeignSubsidiariesMember

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 25

-Paragraph 20

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314

+ Details

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- Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Deferred Tax Assets Net Operating Loss

+ References

No definition available.

+ Details

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Namespace Prefix:	wetf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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