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Exit Activities - Additional Information (Detail) $ in Thousands, $ in Thousands			9 Months Ended
	Feb. 19, 2020 USD ($)	Feb. 19, 2020 CAD ($)	Sep. 30, 2020 USD ($)
Recognized gain loss on sale of business			$ 2,877
WisdomTree Asset Management Canada, Inc [Member]
Proceeds from divestiture of businesses	$ 2,774	$ 3,720
Term of contingent payments	3 years	3 years
WisdomTree Asset Management Canada, Inc [Member] | Minimum [Member]
Additional consideration payable		$ 2,000
WisdomTree Asset Management Canada, Inc [Member] | Maximum [Member]
Additional consideration payable		$ 8,000

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- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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