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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, 2020	Dec. 31, 2019
Net amounts of recognized assets
Marketable securities, Assets	$ 245	$ 14,228
Government debt, Assets	56,686	56,761
Securities owned - Equities, Assets	244	36
FX/commodities options, Assets		26
Forwards, Assets	145	564
FX swaps, Assets	1,047	1,278
Corporate bonds, Assets	599	728
Total, Assets	58,966	73,621
Net amounts of recognized Liabilities
FX/commodities options, Liabilities	59
FX swaps, Liabilities	1,018	2,244
Forwards, Liabilities	2,431	1,285
Futures, Liabilities	589	624
Contingent consideration, Liabilities	38,709	42,159
Total, Liabilities	42,806	46,312
Netting and Collateral [Member]
Net amounts of recognized assets
Forwards, Assets	(6)	(142)
FX swaps, Assets	(174)	(394)
Futures, Assets	(74,974)	(2,044)
Total, Assets	(75,154)	(2,580)
Net amounts of recognized Liabilities
FX swaps, Liabilities	(174)	(394)
Forwards, Liabilities	(6)	(142)
Futures, Liabilities	(74,974)	(2,044)
Total, Liabilities	(75,154)	(2,580)
Level 1 [Member]
Net amounts of recognized assets
Marketable securities, Assets	245	14,228
Government debt, Assets	56,686	56,761
Securities owned - Equities, Assets	244	36
FX/commodities options, Assets		26
Total, Assets	57,175	71,051
Net amounts of recognized Liabilities
FX/commodities options, Liabilities	59
Total, Liabilities	59
Level 2 [Member]
Net amounts of recognized assets
Forwards, Assets	151	706
FX swaps, Assets	1,221	1,672
Futures, Assets	74,974	2,044
Corporate bonds, Assets	599	728
Total, Assets	76,945	5,150
Net amounts of recognized Liabilities
FX swaps, Liabilities	1,192	2,638
Forwards, Liabilities	2,437	1,427
Futures, Liabilities	75,563	2,668
Total, Liabilities	79,192	6,733
Level 3 [Member]
Net amounts of recognized Liabilities
Contingent consideration, Liabilities	38,709	42,159
Total, Liabilities	$ 38,709	$ 42,159

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