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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, 2022	Dec. 31, 2021
Net amounts of recognized assets
Marketable securities	$ 293	$ 406
Securities owned—Government debt	37,918	40,602
Securities owned—Equities	787	235
Securities owned—Corporate bonds	445	1
Forwards	837	392
FX swaps	9,582	2,487
Futures	0	0
Total	49,862	44,123
Net amounts of recognized Liabilities
FX swaps	6,083	1,490
Forwards	656	419
Futures	478	940
Contingent consideration	22,791	29,756
Total	30,008	32,605
Netting and Collateral
Net amounts of recognized assets
Marketable securities	0	0
Securities owned—Government debt	0	0
Securities owned—Equities	0	0
Securities owned—Corporate bonds	0	0
Forwards	(205)	(60)
FX swaps	(663)	(538)
Futures	(103,886)	(70,497)
Total	(104,754)	(71,095)
Net amounts of recognized Liabilities
FX swaps	(663)	(538)
Forwards	(205)	(60)
Futures	(103,886)	(70,497)
Contingent consideration	0	0
Total	(104,754)	(71,095)
Level 1
Net amounts of recognized assets
Marketable securities	293	406
Securities owned—Government debt	37,918	40,602
Securities owned—Equities	787	235
Securities owned—Corporate bonds	0	0
Forwards	0	0
FX swaps	0	0
Futures	0	0
Total	38,998	41,243
Net amounts of recognized Liabilities
FX swaps	0	0
Forwards	0	0
Futures	0	0
Contingent consideration	0	0
Total	0	0
Level 2
Net amounts of recognized assets
Marketable securities	0	0
Securities owned—Government debt	0	0
Securities owned—Equities	0	0
Securities owned—Corporate bonds	445	1
Forwards	1,042	452
FX swaps	10,245	3,025
Futures	103,886	70,497
Total	115,618	73,975
Net amounts of recognized Liabilities
FX swaps	6,746	2,028
Forwards	861	479
Futures	104,364	71,437
Contingent consideration	0	0
Total	111,971	73,944
Level 3
Net amounts of recognized assets
Marketable securities	0	0
Securities owned—Government debt	0	0
Securities owned—Equities	0	0
Securities owned—Corporate bonds	0	0
Forwards	0	0
FX swaps	0	0
Futures	0	0
Total	0	0
Net amounts of recognized Liabilities
FX swaps	0	0
Forwards	0	0
Futures	0	0
Contingent consideration	22,791	29,756
Total	$ 22,791	$ 29,756

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