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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
Sep. 30, 2024
Dec. 31, 2023
Net amounts of recognized assets    
Financial instruments owned, at fair value—Domestic government debt $ 194,309 $ 31,141
Financial instruments owned, at fair value—Foreign government debt 15,879 14,164
Financial instruments owned, at fair value—Equities 636 487
Financial instruments owned, at fair value—Corporate bonds 202  
Netting and Collateral (62,583) (75,718)
Net amounts presented in the statements of financial condition, assets 5,104 3,607
Total 216,130 49,399
Net amounts of recognized liabilities    
Netting and Collateral (62,583) (75,718)
Net amounts presented in the statements of financial condition, liabilities 6,690 5,756
Contingent consideration 8,788 11,929
Total 15,478 17,685
FX swaps    
Net amounts of recognized assets    
Netting and Collateral (724) (793)
Net amounts presented in the statements of financial condition, assets 3,753 2,674
Net amounts of recognized liabilities    
Netting and Collateral (724) (793)
Net amounts presented in the statements of financial condition, liabilities 5,938 5,119
Forwards    
Net amounts of recognized assets    
Netting and Collateral (77) (50)
Net amounts presented in the statements of financial condition, assets 1,264 805
Net amounts of recognized liabilities    
Netting and Collateral (77) (50)
Net amounts presented in the statements of financial condition, liabilities 703 609
Futures    
Net amounts of recognized assets    
Netting and Collateral (55,742) (62,693)
Net amounts presented in the statements of financial condition, assets 0 0
Net amounts of recognized liabilities    
Netting and Collateral (55,742) (62,693)
Net amounts presented in the statements of financial condition, liabilities 49 28
Interest rate swaps    
Net amounts of recognized assets    
Netting and Collateral (6,040) 12,182
Net amounts presented in the statements of financial condition, assets 87 128
Net amounts of recognized liabilities    
Netting and Collateral (6,040) (12,182)
Net amounts presented in the statements of financial condition, liabilities 0 0
Level 1    
Net amounts of recognized assets    
Financial instruments owned, at fair value—Domestic government debt 194,309 31,141
Financial instruments owned, at fair value—Foreign government debt 0 0
Financial instruments owned, at fair value—Equities 636 487
Financial instruments owned, at fair value—Corporate bonds 0  
Total 250,687 31,628
Net amounts of recognized liabilities    
Contingent consideration 0 0
Total 55,791 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 | Futures    
Net amounts of recognized assets    
Derivative asset 55,742 0
Net amounts of recognized liabilities    
Derivative liability 55,791 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 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 15,879 14,164
Financial instruments owned, at fair value—Equities 0 0
Financial instruments owned, at fair value—Corporate bonds 202  
Total 28,026 93,489
Net amounts of recognized liabilities    
Contingent consideration 0 0
Total 13,482 81,474
Level 2 | FX swaps    
Net amounts of recognized assets    
Derivative asset 4,477 3,467
Net amounts of recognized liabilities    
Derivative liability 6,662 5,912
Level 2 | Forwards    
Net amounts of recognized assets    
Derivative asset 1,341 855
Net amounts of recognized liabilities    
Derivative liability 780 659
Level 2 | Futures    
Net amounts of recognized assets    
Derivative asset 0 62,693
Net amounts of recognized liabilities    
Derivative liability 0 62,721
Level 2 | Interest rate swaps    
Net amounts of recognized assets    
Derivative asset 6,127 12,310
Net amounts of recognized liabilities    
Derivative liability 6,040 12,182
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 8,788 11,929
Total 8,788 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 | Futures    
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 0
Net amounts of recognized liabilities    
Derivative liability $ 0 $ 0