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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, 2023
Dec. 31, 2022
Net amounts of recognized assets    
Financial instruments owned, at fair value—Domestic government debt $ 32,098 $ 31,175
Financial instruments owned, at fair value—Foreign government debt 12,429 7,678
Financial instruments owned, at fair value—Equities 586 466
Financial instruments owned, at fair value—Corporate bonds 340  
Netting and Collateral (136,620) (66,271)
Net amounts presented in the statements of financial condition, assets 4,343 3,762
Total 49,796 43,081
Net amounts of recognized liabilities    
Netting and Collateral (136,620) (66,271)
Net amounts presented in the statements of financial condition, liabilities 4,935 7,633
Contingent consideration 5,999 24,279
Total 10,934 31,912
FX swaps    
Net amounts of recognized assets    
Netting and Collateral (376) (489)
Net amounts presented in the statements of financial condition, assets 2,838 3,134
Net amounts of recognized liabilities    
Netting and Collateral (376) (489)
Net amounts presented in the statements of financial condition, liabilities 3,901 5,796
Forwards    
Net amounts of recognized assets    
Netting and Collateral (101) (143)
Net amounts presented in the statements of financial condition, assets 274 603
Net amounts of recognized liabilities    
Netting and Collateral (101) (143)
Net amounts presented in the statements of financial condition, liabilities 1,034 569
Interest rate swaps    
Net amounts of recognized assets    
Netting and Collateral (66,090)  
Net amounts presented in the statements of financial condition, assets 547 25
Net amounts of recognized liabilities    
Netting and Collateral (66,090) (870)
Net amounts presented in the statements of financial condition, liabilities 0 0
Futures    
Net amounts of recognized assets    
Netting and Collateral (70,053) (64,769)
Net amounts presented in the statements of financial condition, assets 684 0
Net amounts of recognized liabilities    
Netting and Collateral (70,053) (64,769)
Net amounts presented in the statements of financial condition, liabilities 0 1,268
Level 1    
Net amounts of recognized assets    
Financial instruments owned, at fair value—Domestic government debt 32,098 31,175
Financial instruments owned, at fair value—Foreign government debt 0 0
Financial instruments owned, at fair value—Equities 586 466
Financial instruments owned, at fair value—Corporate bonds 0  
Total 32,684 31,641
Net amounts of recognized liabilities    
Contingent consideration 0 0
Total 0 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 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 12,429 7,678
Financial instruments owned, at fair value—Equities 0 0
Financial instruments owned, at fair value—Corporate bonds 340  
Total 153,732 77,711
Net amounts of recognized liabilities    
Contingent consideration   0
Total 141,555 73,904
Level 2 | FX swaps    
Net amounts of recognized assets    
Derivative asset 3,214 3,623
Net amounts of recognized liabilities    
Derivative liability 4,277 6,285
Level 2 | Forwards    
Net amounts of recognized assets    
Derivative asset 375 746
Net amounts of recognized liabilities    
Derivative liability 1,135 712
Level 2 | Interest rate swaps    
Net amounts of recognized assets    
Derivative asset 66,637 895
Net amounts of recognized liabilities    
Derivative liability 66,090 870
Level 2 | Futures    
Net amounts of recognized assets    
Derivative asset 70,737 64,769
Net amounts of recognized liabilities    
Derivative liability 70,053 66,037
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 5,999 24,279
Total 5,999 24,279
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