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Related Party Transactions - Additional Information (Detail) - WisdomTree ETF [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Investment	$ 2,588		$ 2,588		$ 1,691
Maximum [Member]
Related Party Transaction [Line Items]
Loss on investment	$ (100)	$ (100)	$ (100)	$ (100)

X

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

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

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