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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

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