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Fair value measurements - Fair Value Amounts of Derivative Instruments and their Effect on Statement of Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income (pre-tax) Gain (Loss) | $ 3,074 | $ 2,933
Commodity contracts | Principal transactions revenue | Futures |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income (pre-tax) Gain (Loss) | 3,083 | 2,842
Other contracts | Principal transactions revenue | TBAs |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income (pre-tax) Gain (Loss) | 1 | 26
Other contracts | Other revenue | Foreign exchange forward contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income (pre-tax) Gain (Loss) | $ (10) | $ 65

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