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Financial Instruments Owned, at Fair Value (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]          
Aggregate securities owned $ 139,470   $ 139,470   $ 186,197
Unrealized gains $ 0 $ 0 $ 100 $ 0