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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
Dec. 31, 2020
Dec. 31, 2019
Net amounts of recognized assets    
Marketable securities, Assets $ 349 $ 14,228
Government debt, Assets 57,918 56,761
FX/commodities options, Assets 74 26
Securities owned - Equities, Assets 75 36
Forwards, Assets 295 564
FX swaps, Assets 562 1,278
Corporate bonds, Assets 579 728
Total, Assets 59,852 73,621
Net amounts of recognized Liabilities    
Futures, Liabilities 926 624
FX swaps, Liabilities 319 2,244
Forwards, Liabilities 215 1,285
Contingent consideration, Liabilities 39,791 42,159
Total, Liabilities 41,251 46,312
Netting and Collateral [Member]    
Net amounts of recognized assets    
Forwards, Assets (43) (142)
FX swaps, Assets (21) (394)
Futures, Assets (41,257) (2,044)
Total, Assets (41,321) (2,580)
Net amounts of recognized Liabilities    
Futures, Liabilities (41,257) (2,044)
FX swaps, Liabilities (21) (394)
Forwards, Liabilities (43) (142)
Total, Liabilities (41,321) (2,580)
Level 1 [Member]    
Net amounts of recognized assets    
Marketable securities, Assets 349 14,228
Government debt, Assets 57,918 56,761
FX/commodities options, Assets 74 26
Securities owned - Equities, Assets 75 36
Total, Assets 58,416 71,051
Level 2 [Member]    
Net amounts of recognized assets    
Forwards, Assets 338 706
FX swaps, Assets 583 1,672
Futures, Assets 41,257 2,044
Corporate bonds, Assets 579 728
Total, Assets 42,757 5,150
Net amounts of recognized Liabilities    
Futures, Liabilities 42,183 2,668
FX swaps, Liabilities 340 2,638
Forwards, Liabilities 258 1,427
Total, Liabilities 42,781 6,733
Level 3 [Member]    
Net amounts of recognized Liabilities    
Contingent consideration, Liabilities 39,791 42,159
Total, Liabilities $ 39,791 $ 42,159