Receivables from and Payables to Broker-dealers, Clearing Organizations and Customers - Schedule of Receivables from and Payables to Broker-dealers, Clearing Organizations and Customers (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Receivables from broker-dealers, clearing organizations and customers:
Securities failed-to-deliver - broker-dealers and clearing organizations	$ 109,307	$ 282,125
Securities failed-to-deliver - customers	136,424	284,322
Cash deposits with clearing organizations and broker-dealers	107,652	115,151
Other	4,345	6,338
Total	357,728	687,936
Payables to broker-dealers, clearing organizations and customers:
Securities failed-to-receive - broker-dealers and clearing organizations	158,694	125,022
Securities failed-to-receive - customers	51,916	405,186
Other	8,235	7,190
Total	$ 218,845	$ 537,398