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Contingent Payments - Additional Information (Detail) $ in Thousands, $ in Thousands			3 Months Ended		9 Months Ended
	Feb. 19, 2020 USD ($)	Feb. 19, 2020 CAD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 CAD ($)	Dec. 31, 2020 USD ($)	May 04, 2020 USD ($)
Recognized gain loss on sale of business					$ 787	$ 2,877
Impairment			$ 15,853	$ 3,080	16,156	22,752
WisdomTree Asset Management Canada, Inc [Member]
Proceeds from divestiture of businesses	$ 2,774	$ 3,720
Additional consideration payable			2,360		2,360		$ 3,000
Recognized gain loss on sale of business						2,877
WisdomTree Asset Management Canada, Inc [Member] | Other gains and losses [Member]
Recognized gain loss on sale of business			787
WisdomTree Asset Management Canada, Inc [Member] | Minimum [Member]
Additional consideration payable							0
WisdomTree Asset Management Canada, Inc [Member] | Maximum [Member]
Additional consideration payable							$ 4,000
Advisor Engine [Member]
Maximum Amount of Contingent Payments That May be Received									$ 10,408
Contingent payments			$ 0		$ 0			$ 0
Gain (Loss) on Disposition of Assets				$ 225		1,093
Advisor Engine [Member] | Fair Value Of Upfront Consideration Received [Member]
Fair value of upfront consideration received									$ 9,592
Advisor Engine Financial Interest [Member] | Financial Interests [Member]
Impairment						$ 19,672

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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

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