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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
Jun. 30, 2024
Dec. 31, 2023
Net amounts of recognized assets    
Financial instruments owned, at fair value—Domestic government debt $ 178,142 $ 31,141
Financial instruments owned, at fair value—Foreign government debt 15,362 14,164
Financial instruments owned, at fair value—Equities 477 487
Financial instruments owned, at fair value—Corporate bonds 7  
Netting and Collateral (55,311) (75,718)
Net amounts presented in the statements of financial condition, assets 4,592 3,607
Total 198,580 49,399
Net amounts of recognized liabilities    
Netting and Collateral (55,311) (75,718)
Net amounts presented in the statements of financial condition, liabilities 1,540 5,756
Contingent consideration 8,631 11,929
Total 10,171 17,685
FX swaps    
Net amounts of recognized assets    
Netting and Collateral (561) (793)
Net amounts presented in the statements of financial condition, assets 3,924 2,674
Net amounts of recognized liabilities    
Netting and Collateral (561) (793)
Net amounts presented in the statements of financial condition, liabilities 1,230 5,119
Forwards    
Net amounts of recognized assets    
Netting and Collateral (68) (50)
Net amounts presented in the statements of financial condition, assets 330 805
Net amounts of recognized liabilities    
Netting and Collateral (68) (50)
Net amounts presented in the statements of financial condition, liabilities 310 609
Interest rate swaps    
Net amounts of recognized assets    
Netting and Collateral (2,628)  
Net amounts presented in the statements of financial condition, assets 63 128
Net amounts of recognized liabilities    
Netting and Collateral (2,628) (12,182)
Net amounts presented in the statements of financial condition, liabilities 0 0
Futures    
Net amounts of recognized assets    
Netting and Collateral (52,054) (62,693)
Net amounts presented in the statements of financial condition, assets 275 0
Net amounts of recognized liabilities    
Netting and Collateral (52,054) (62,693)
Net amounts presented in the statements of financial condition, liabilities 0 28
Level 1    
Net amounts of recognized assets    
Financial instruments owned, at fair value—Domestic government debt 178,142 31,141
Financial instruments owned, at fair value—Foreign government debt 0 0
Financial instruments owned, at fair value—Equities 477 487
Financial instruments owned, at fair value—Corporate bonds 0  
Total 230,948 31,628
Net amounts of recognized liabilities    
Contingent consideration 0 0
Total 52,054 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 52,329 0
Net amounts of recognized liabilities    
Derivative liability 52,054 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 15,362 14,164
Financial instruments owned, at fair value—Equities 0 0
Financial instruments owned, at fair value—Corporate bonds 7  
Total 22,943 93,489
Net amounts of recognized liabilities    
Contingent consideration 0 0
Total 4,797 81,474
Level 2 | FX swaps    
Net amounts of recognized assets    
Derivative asset 4,485 3,467
Net amounts of recognized liabilities    
Derivative liability 1,791 5,912
Level 2 | Forwards    
Net amounts of recognized assets    
Derivative asset 398 855
Net amounts of recognized liabilities    
Derivative liability 378 659
Level 2 | Interest rate swaps    
Net amounts of recognized assets    
Derivative asset 2,691 12,310
Net amounts of recognized liabilities    
Derivative liability 2,628 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 8,631 11,929
Total 8,631 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 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