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Variable Interest Entity - Summary of Information about Variable Interests (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Carrying Amount - Assets
Preferred stock	$ 25,000,000	$ 25,000,000
Note receivable - unsecured	19,165,000	18,748,000
Option	3,278,000	3,278,000
Total carrying amount - Assets	47,443,000	47,026,000
Maximum exposure to loss	$ 55,443,000	$ 55,026,000

X

- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5747-111685

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph a
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685

+ Details

Name:	us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssetsAndLiabilitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Variable interest entity, nonconsolidated, carrying amount, note receivable - unsecured.

+ References

No definition available.

+ Details

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

X

- Definition

Variable interest entity, nonconsolidated, carrying amount - option.

+ References

No definition available.

+ Details

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

X

- Definition

Variable interest entity, nonconsolidated, carrying amount, preferred stock.

+ References

No definition available.

+ Details

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