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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Nov. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Apr. 11, 2018
Indefinite-lived Intangible Assets [Line Items]
Goodwill		$ 85,856	$ 85,856
Intangible asset related to its customary advisory agreement		$ 601,247	603,294
Acquisition completion date		Apr. 11, 2018
Acquisition of ETFS Business [Member]
Indefinite-lived Intangible Assets [Line Items]
Goodwill				$ 84,057
Intangible asset related to its customary advisory agreement	$ 0	$ 601,247	$ 601,247
Weighted average cost of capital percentage	9.00%
Acquisition of ETFS Business [Member] | Minimum [Member]
Indefinite-lived Intangible Assets [Line Items]
Revenue growth multiple	3.00%
Acquisition of ETFS Business [Member] | Maximum [Member]
Indefinite-lived Intangible Assets [Line Items]
Revenue growth multiple	11.00%
Acquisition of ETFS Business [Member] | Weighted Average [Member]
Indefinite-lived Intangible Assets [Line Items]
Revenue growth multiple	3.50%

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