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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, 2019 | Dec. 31, 2018
--- | --- | ---
Net amounts of recognized assets |  |
Marketable securities, Assets | $ 29,989 | $ 32,064
Government debt, Assets | 57,566 | 57,788
Corporate bonds, Assets | 1,841 |
Securities owned - Equities, Assets | 739 | 620
Foreign exchange/commodities options, Assets |  | 39
Forwards, Assets | 28 | 236
Foreign exchange swaps, Assets | 2,594 | 1,611
Futures, Assets | 331 | 93
Total, Assets | 93,088 | 92,451
Net amounts of recognized Liabilities |  |
Foreign exchange/commodities options, Liabilities | 42 | 88,016
Foreign exchange swaps, Liabilities | 2,092 | 2,072
Forwards, Liabilities | 171 | 639
Futures, Liabilities | 231 | 402
Contingent consideration, Liabilities | 42,139 | 45,984
Total, Liabilities | 44,675 | 137,113
Netting and Collateral [Member] |  |
Net amounts of recognized assets |  |
Foreign exchange/commodities options, Assets |  | (482,712)
Forwards, Assets | (5) | (17)
Foreign exchange swaps, Assets | (961) | (327)
Futures, Assets | (9,405) | (57,386)
Total, Assets | (10,371) | (540,442)
Net amounts of recognized Liabilities |  |
Foreign exchange/commodities options, Liabilities |  | (482,712)
Foreign exchange swaps, Liabilities | (961) | (327)
Forwards, Liabilities | (5) | (17)
Futures, Liabilities | (9,405) | (57,386)
Total, Liabilities | (10,371) | (540,442)
Level 1 [Member] |  |
Net amounts of recognized assets |  |
Marketable securities, Assets | 29,989 | 32,064
Government debt, Assets | 57,566 | 57,788
Securities owned - Equities, Assets | 739 | 620
Foreign exchange/commodities options, Assets |  | 482,751
Total, Assets | 88,294 | 573,223
Net amounts of recognized Liabilities |  |
Foreign exchange/commodities options, Liabilities | 42 | 570,728
Total, Liabilities | 42 | 570,728
Level 2 [Member] |  |
Net amounts of recognized assets |  |
Corporate bonds, Assets | 1,841 |
Forwards, Assets | 33 | 253
Foreign exchange swaps, Assets | 3,555 | 1,938
Futures, Assets | 9,736 | 57,479
Total, Assets | 15,165 | 59,670
Net amounts of recognized Liabilities |  |
Foreign exchange swaps, Liabilities | 3,053 | 2,399
Forwards, Liabilities | 176 | 656
Futures, Liabilities | 9,636 | 57,788
Total, Liabilities | 12,865 | 60,843
Level 3 [Member] |  |
Net amounts of recognized Liabilities |  |
Contingent consideration, Liabilities | 42,139 | 45,984
Total, Liabilities | $ 42,139 | $ 45,984

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