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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 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Net amounts of recognized assets |  |
Marketable securities, Assets | $ 245 | $ 14,228
Government debt, Assets | 56,686 | 56,761
Securities owned - Equities, Assets | 244 | 36
FX/commodities options, Assets |  | 26
Forwards, Assets | 145 | 564
FX swaps, Assets | 1,047 | 1,278
Corporate bonds, Assets | 599 | 728
Total, Assets | 58,966 | 73,621
Net amounts of recognized Liabilities |  |
FX/commodities options, Liabilities | 59 |
FX swaps, Liabilities | 1,018 | 2,244
Forwards, Liabilities | 2,431 | 1,285
Futures, Liabilities | 589 | 624
Contingent consideration, Liabilities | 38,709 | 42,159
Total, Liabilities | 42,806 | 46,312
Netting and Collateral [Member] |  |
Net amounts of recognized assets |  |
Forwards, Assets | (6) | (142)
FX swaps, Assets | (174) | (394)
Futures, Assets | (74,974) | (2,044)
Total, Assets | (75,154) | (2,580)
Net amounts of recognized Liabilities |  |
FX swaps, Liabilities | (174) | (394)
Forwards, Liabilities | (6) | (142)
Futures, Liabilities | (74,974) | (2,044)
Total, Liabilities | (75,154) | (2,580)
Level 1 [Member] |  |
Net amounts of recognized assets |  |
Marketable securities, Assets | 245 | 14,228
Government debt, Assets | 56,686 | 56,761
Securities owned - Equities, Assets | 244 | 36
FX/commodities options, Assets |  | 26
Total, Assets | 57,175 | 71,051
Net amounts of recognized Liabilities |  |
FX/commodities options, Liabilities | 59 |
Total, Liabilities | 59 |
Level 2 [Member] |  |
Net amounts of recognized assets |  |
Forwards, Assets | 151 | 706
FX swaps, Assets | 1,221 | 1,672
Futures, Assets | 74,974 | 2,044
Corporate bonds, Assets | 599 | 728
Total, Assets | 76,945 | 5,150
Net amounts of recognized Liabilities |  |
FX swaps, Liabilities | 1,192 | 2,638
Forwards, Liabilities | 2,437 | 1,427
Futures, Liabilities | 75,563 | 2,668
Total, Liabilities | 79,192 | 6,733
Level 3 [Member] |  |
Net amounts of recognized Liabilities |  |
Contingent consideration, Liabilities | 38,709 | 42,159
Total, Liabilities | $ 38,709 | $ 42,159

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