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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, 2020	Dec. 31, 2019
Net amounts of recognized assets
Marketable securities, Assets	$ 278	$ 14,228
Government debt, Assets	57,975	56,761
Securities owned - Equities, Assets	163	36
FX/commodities options, Assets	110	26
Forwards, Assets	161	564
FX swaps, Assets	624	1,278
Corporate bonds, Assets	547	728
Total, Assets	59,858	73,621
Net amounts of recognized Liabilities
FX swaps, Liabilities	315	2,244
Forwards, Liabilities	1,889	1,285
Futures, Liabilities	617	624
Contingent consideration, Liabilities	35,107	42,159
Total, Liabilities	37,928	46,312
Netting and Collateral [Member]
Net amounts of recognized assets
FX/commodities options, Assets	(2)
Forwards, Assets	(12)	(142)
FX swaps, Assets	(74)	(394)
Futures, Assets	(42,521)	(2,044)
Total, Assets	(42,609)	(2,580)
Net amounts of recognized Liabilities
FX/commodities options, Liabilities	(2)
FX swaps, Liabilities	(74)	(394)
Forwards, Liabilities	(12)	(142)
Futures, Liabilities	(42,521)	(2,044)
Total, Liabilities	(42,609)	(2,580)
Level 1 [Member]
Net amounts of recognized assets
Marketable securities, Assets	278	14,228
Government debt, Assets	57,975	56,761
Securities owned - Equities, Assets	163	36
FX/commodities options, Assets	112	26
Total, Assets	58,528	71,051
Net amounts of recognized Liabilities
FX/commodities options, Liabilities	2
Total, Liabilities	2
Level 2 [Member]
Net amounts of recognized assets
Forwards, Assets	173	706
FX swaps, Assets	698	1,672
Futures, Assets	42,521	2,044
Corporate bonds, Assets	547	728
Total, Assets	43,939	5,150
Net amounts of recognized Liabilities
FX swaps, Liabilities	389	2,638
Forwards, Liabilities	1,901	1,427
Futures, Liabilities	43,138	2,668
Total, Liabilities	45,428	6,733
Level 3 [Member]
Net amounts of recognized Liabilities
Contingent consideration, Liabilities	35,107	42,159
Total, Liabilities	$ 35,107	$ 42,159

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