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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, 2021 | Dec. 31, 2020
--- | --- | ---
Net amounts of recognized assets |  |
Marketable securities | $ 360 | $ 349
Government debt | 47,959 | 57,918
Securities owned—Equities | 110 | 75
FX/commodities options |  | 74
Forwards1 | 690 | 295
FX swaps | 4,553 | 562
Futures | 0 | 0
Corporate bonds | 1,153 | 579
Total | 54,825 | 59,852
Net amounts of recognized Liabilities |  |
FX swaps | 4,551 | 319
Forwards1 | 653 | 215
Futures | 1,217 | 926
Contingent consideration | 32,975 | 39,791
Total | 39,396 | 41,251
Disposal Group, Held-for-sale, Not Discontinued Operations |  |
Net amounts of recognized assets |  |
Forwards1 | 30 |
Net amounts of recognized Liabilities |  |
Forwards1 | 7 |
Netting and Collateral |  |
Net amounts of recognized assets |  |
Marketable securities | 0 | 0
Government debt | 0 | 0
Securities owned—Equities | 0 | 0
FX/commodities options |  | 0
Forwards1 | (258) | (43)
FX swaps | (1,176) | (21)
Futures | (75,703) | (41,257)
Corporate bonds | 0 | 0
Total | (77,137) | (41,321)
Net amounts of recognized Liabilities |  |
FX swaps | (1,176) | (21)
Forwards1 | (258) | (43)
Futures | (75,703) | (41,257)
Contingent consideration | 0 | 0
Total | (77,137) | (41,321)
Level 1 |  |
Net amounts of recognized assets |  |
Marketable securities | 360 | 349
Government debt | 47,959 | 57,918
Securities owned—Equities | 110 | 75
FX/commodities options |  | 74
Forwards1 | 0 | 0
FX swaps | 0 | 0
Futures | 0 | 0
Corporate bonds | 0 | 0
Total | 48,429 | 58,416
Net amounts of recognized Liabilities |  |
FX swaps | 0 | 0
Forwards1 | 0 | 0
Futures | 0 | 0
Contingent consideration | 0 | 0
Total | 0 | 0
Level 2 |  |
Net amounts of recognized assets |  |
Marketable securities | 0 | 0
Government debt | 0 | 0
Securities owned—Equities | 0 | 0
FX/commodities options |  | 0
Forwards1 | 948 | 338
FX swaps | 5,729 | 583
Futures | 75,703 | 41,257
Corporate bonds | 1,153 | 579
Total | 83,533 | 42,757
Net amounts of recognized Liabilities |  |
FX swaps | 5,727 | 340
Forwards1 | 911 | 258
Futures | 76,920 | 42,183
Contingent consideration | 0 | 0
Total | 83,558 | 42,781
Level 3 |  |
Net amounts of recognized assets |  |
Marketable securities | 0 | 0
Government debt | 0 | 0
Securities owned—Equities | 0 | 0
FX/commodities options |  | 0
Forwards1 | 0 | 0
FX swaps | 0 | 0
Futures | 0 | 0
Corporate bonds | 0 | 0
Total | 0 | 0
Net amounts of recognized Liabilities |  |
FX swaps | 0 | 0
Forwards1 | 0 | 0
Futures | 0 | 0
Contingent consideration | 32,975 | 39,791
Total | $ 32,975 | $ 39,791

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