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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Securities owned, at fair value	$ 13,110		$ 13,110		$ 17,319
Gains and losses related to certain WisdomTree ETFs	298	$ (205)	8	$ 148
WisdomTree ETF [Member]
Related Party Transaction [Line Items]
Securities owned, at fair value	$ 12,929		$ 12,929		$ 16,886

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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+ References

No definition available.

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Fair value of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model.

+ References

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-Name Accounting Standards Codification
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