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Derivatives - Summary of Gains and (Losses) on Derivative Contracts (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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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

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