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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, 2019	Dec. 31, 2018
Net amounts of recognized assets
Marketable securities, Assets	$ 14,228	$ 32,064
Government debt, Assets	56,761	57,788
Securities owned - Equities, Assets	36	620
FX/commodities options, Assets	26	39
Forwards, Assets	564	236
FX swaps, Assets	1,278	1,611
Futures, Assets		93
Corporate bonds, Assets	728
Total, Assets	73,621	92,451
Net amounts of recognized Liabilities
FX/commodities options, Liabilities		88,016
FX swaps, Liabilities	2,244	2,072
Forwards, Liabilities	1,285	639
Futures, Liabilities	624	402
Contingent consideration, Liabilities	42,159	45,984
Total, Liabilities	46,312	137,113
Netting and Collateral [Member]
Net amounts of recognized assets
FX/commodities options, Assets		(482,712)
Forwards, Assets	(142)	(17)
FX swaps, Assets	(394)	(327)
Futures, Assets	(2,044)	(57,386)
Total, Assets	(2,580)	(540,442)
Net amounts of recognized Liabilities
FX/commodities options, Liabilities		(482,712)
FX swaps, Liabilities	(394)	(327)
Forwards, Liabilities	(142)	(17)
Futures, Liabilities	(2,044)	(57,386)
Total, Liabilities	(2,580)	(540,442)
Level 1 [Member]
Net amounts of recognized assets
Marketable securities, Assets	14,228	32,064
Government debt, Assets	56,761	57,788
Securities owned - Equities, Assets	36	620
FX/commodities options, Assets	26	482,751
Total, Assets	71,051	573,223
Net amounts of recognized Liabilities
FX/commodities options, Liabilities		570,728
Total, Liabilities		570,728
Level 2 [Member]
Net amounts of recognized assets
Forwards, Assets	706	253
FX swaps, Assets	1,672	1,938
Futures, Assets	2,044	57,479
Corporate bonds, Assets	728
Total, Assets	5,150	59,670
Net amounts of recognized Liabilities
FX swaps, Liabilities	2,638	2,399
Forwards, Liabilities	1,427	656
Futures, Liabilities	2,668	57,788
Total, Liabilities	6,733	60,843
Level 3 [Member]
Net amounts of recognized Liabilities
Contingent consideration, Liabilities	42,159	45,984
Total, Liabilities	$ 42,159	$ 45,984

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