Derivatives - Summary of Gains and (Losses) on Derivative Contracts (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Principal transactions	Principal transactions	Principal transactions	Principal transactions
Gain (loss), net on derivative contract	$ 9,697	$ 5,280	$ 17,571	$ 11,727
Futures
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss), net on derivative contract	5,354	2,833	9,931	6,639
Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss), net on derivative contract	2,994	1,832	5,376	3,928
FX swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss), net on derivative contract	1,208	558	2,029	1,056
FX/commodities options
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss), net on derivative contract	$ 141	$ 57	$ 235	$ 104