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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Gains and losses related to certain WisdomTree ETFs	$ (92)	$ 86	$ 75	$ 94
WisdomTree ETF [Member]
Related Party Transaction [Line Items]
Investment	$ 21,180		$ 21,180		$ 23,932

X

- Definition

Amount of realized and unrealized gain (loss) on investment.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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