Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents maturity period, maximum	90 days
Short-term lease exception - Lease term			12 months
Proceeds from the sale of securities owned, at fair value	$ 13,639	$ 1,232
Purchase of securities owned, at fair value	$ 25,461	1,657
Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amounts collected on behalf of third parties		1,574
Proceeds from the sale of securities owned, at fair value		1,232
Purchase of securities owned, at fair value		$ 1,657