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Acquisitions and Exit Activities - Additional Information (Detail) $ in Thousands, $ in Thousands				12 Months Ended
	Feb. 19, 2020 USD ($)	Feb. 19, 2020 CAD ($)	Apr. 11, 2018 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Recognized gain loss on sale of business				$ 2,877
Business acquistions proforma revenue						$ 297,541
Business acquistions proforma income						37,336
Acquisition and disposition-related costs				$ 416	$ 902	$ 11,454
Acquisition of ETFS Business [Member]
Business acquisition, cash paid			$ 253,000
Business acquisition, number of common shares that the preferred stock is convertible into | shares			14,750,000
Acquisition of ETFS Business [Member] | Common Stock [Member]
Business acquisition, number of shares to be issued | shares			15,250,000
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
Series A Non-Voting Convertible Preferred Stock [Member] | Acquisition of ETFS Business [Member]
Business acquisition, number of shares to be issued | shares			14,750

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