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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