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Fair Value of Financial Assets and Liabilities - Fair Value Hierarchy of Financial Assets and Liabilities under U.S. GAAP Guidance (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Net amounts of recognized assets |  |
Financial instruments owned, at fair value—Domestic government debt | $ 31,388 | $ 31,141
Financial instruments owned, at fair value—Foreign government debt | 16,343 | 14,164
Financial instruments owned, at fair value—Equities | 780 | 487
Financial instruments owned, at fair value—Corporate bonds | 394 |
Netting and Collateral | (79,449) | (75,718)
Net amounts presented in the statements of financial condition, assets | 4,989 | 3,607
Total | 53,894 | 49,399
Net amounts of recognized liabilities |  |
Netting and Collateral | (79,449) | (75,718)
Net amounts presented in the statements of financial condition, liabilities | 3,085 | 5,756
Contingent consideration | 9,727 | 11,929
Total | 12,812 | 17,685
FX swaps |  |
Net amounts of recognized assets |  |
Netting and Collateral | (596) | (793)
Net amounts presented in the statements of financial condition, assets | 4,067 | 2,674
Net amounts of recognized liabilities |  |
Netting and Collateral | (596) | (793)
Net amounts presented in the statements of financial condition, liabilities | 2,408 | 5,119
Forwards |  |
Net amounts of recognized assets |  |
Netting and Collateral | (30) | (50)
Net amounts presented in the statements of financial condition, assets | 831 | 805
Net amounts of recognized liabilities |  |
Netting and Collateral | (30) | (50)
Net amounts presented in the statements of financial condition, liabilities | 616 | 609
Interest rate swaps |  |
Net amounts of recognized assets |  |
Netting and Collateral | (9,268) |
Net amounts presented in the statements of financial condition, assets | 91 | 128
Net amounts of recognized liabilities |  |
Netting and Collateral | (9,268) | (12,182)
Net amounts presented in the statements of financial condition, liabilities | 0 | 0
Futures |  |
Net amounts of recognized assets |  |
Netting and Collateral | (69,555) | (62,693)
Net amounts presented in the statements of financial condition, assets | 0 | 0
Net amounts of recognized liabilities |  |
Netting and Collateral | (69,555) | (62,693)
Net amounts presented in the statements of financial condition, liabilities | 61 | 28
Level 1 |  |
Net amounts of recognized assets |  |
Financial instruments owned, at fair value—Domestic government debt | 31,388 | 31,141
Financial instruments owned, at fair value—Foreign government debt | 0 | 0
Financial instruments owned, at fair value—Equities | 780 | 487
Financial instruments owned, at fair value—Corporate bonds | 0 |
Total | 101,723 | 31,628
Net amounts of recognized liabilities |  |
Contingent consideration | 0 | 0
Total | 69,616 | 0
Level 1 | FX swaps |  |
Net amounts of recognized assets |  |
Derivative asset | 0 | 0
Net amounts of recognized liabilities |  |
Derivative liability | 0 | 0
Level 1 | Forwards |  |
Net amounts of recognized assets |  |
Derivative asset | 0 | 0
Net amounts of recognized liabilities |  |
Derivative liability | 0 | 0
Level 1 | Interest rate swaps |  |
Net amounts of recognized assets |  |
Derivative asset | 0 | 0
Net amounts of recognized liabilities |  |
Derivative liability | 0 | 0
Level 1 | Futures |  |
Net amounts of recognized assets |  |
Derivative asset | 69,555 | 0
Net amounts of recognized liabilities |  |
Derivative liability | 69,616 | 0
Level 2 |  |
Net amounts of recognized assets |  |
Financial instruments owned, at fair value—Domestic government debt | 0 | 0
Financial instruments owned, at fair value—Foreign government debt | 16,343 | 14,164
Financial instruments owned, at fair value—Equities | 0 | 0
Financial instruments owned, at fair value—Corporate bonds | 394 |
Total | 31,620 | 93,489
Net amounts of recognized liabilities |  |
Contingent consideration | 0 | 0
Total | 12,918 | 81,474
Level 2 | FX swaps |  |
Net amounts of recognized assets |  |
Derivative asset | 4,663 | 3,467
Net amounts of recognized liabilities |  |
Derivative liability | 3,004 | 5,912
Level 2 | Forwards |  |
Net amounts of recognized assets |  |
Derivative asset | 861 | 855
Net amounts of recognized liabilities |  |
Derivative liability | 646 | 659
Level 2 | Interest rate swaps |  |
Net amounts of recognized assets |  |
Derivative asset | 9,359 | 12,310
Net amounts of recognized liabilities |  |
Derivative liability | 9,268 | 12,182
Level 2 | Futures |  |
Net amounts of recognized assets |  |
Derivative asset | 0 | 62,693
Net amounts of recognized liabilities |  |
Derivative liability | 0 | 62,721
Level 3 |  |
Net amounts of recognized assets |  |
Financial instruments owned, at fair value—Domestic government debt | 0 | 0
Financial instruments owned, at fair value—Foreign government debt | 0 | 0
Financial instruments owned, at fair value—Equities | 0 | 0
Financial instruments owned, at fair value—Corporate bonds | 0 |
Total | 0 | 0
Net amounts of recognized liabilities |  |
Contingent consideration | 9,727 | 11,929
Total | 9,727 | 11,929
Level 3 | FX swaps |  |
Net amounts of recognized assets |  |
Derivative asset | 0 | 0
Net amounts of recognized liabilities |  |
Derivative liability | 0 | 0
Level 3 | Forwards |  |
Net amounts of recognized assets |  |
Derivative asset | 0 | 0
Net amounts of recognized liabilities |  |
Derivative liability | 0 | 0
Level 3 | Interest rate swaps |  |
Net amounts of recognized assets |  |
Derivative asset | 0 |
Net amounts of recognized liabilities |  |
Derivative liability | 0 | 0
Level 3 | Futures |  |
Net amounts of recognized assets |  |
Derivative asset | 0 | 0
Net amounts of recognized liabilities |  |
Derivative liability | $ 0 | $ 0

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