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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Apr. 11, 2018
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 86,841	$ 86,841	$ 85,856
Intangible asset related to its customary advisory agreement	$ 604,407	$ 604,407	$ 603,567
Software Development [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years	3 years
Amortization of goodwill and intangible assets	$ 106	$ 156
Finite lived intangible assets remaining useful lives	2 years 10 months 24 days	2 years 10 months 24 days
Acquisition of ETFS Business [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible asset related to its customary advisory agreement				$ 601,247
Series of Individually Immaterial Business Acquisitions [Member]
Indefinite-lived Intangible Assets [Line Items]
Acquisition completion date		Apr. 11, 2018
Securrency [Member]
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 86,841	$ 86,841
Goodwill not deductible for tax purposes	$ 85,042	$ 85,042

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- Definition

Date when the acquirer obtains control of the acquiree, in YYYY-MM-DD format.

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