Consolidated VIEs - Summary of Consolidated VIE Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
ASSETS
Cash and cash equivalents	$ 878,167	$ 1,465,022
Customers and other receivables	156,872	136,345
Investments	869,844	1,007,339
Other assets	519,511	373,081
Total Assets	6,848,346	7,147,181
Liabilities:
Deposits and other customer payables	1,748,858	1,442,701
Other liabilities	622,403	626,203
Total Liabilities	5,303,718	5,494,217
Consolidated VIEs [Member]
ASSETS
Cash and cash equivalents	3,702	3,936
Customers and other receivables	1,558	305
Investments	233,520	204,062
Other assets	462	328
Total Assets	239,242	208,631
Liabilities:
Deposits and other customer payables	781	50
Other liabilities	580	910
Total Liabilities	$ 1,361	$ 960