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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, 2022	Dec. 31, 2021
Net amounts of recognized assets
Marketable securities	$ 402	$ 406
Securities owned—Government debt	33,831	40,602
Securities owned—Equities	685	235
Securities owned—Corporate bonds	2,997	1
Forwards	476	392
FX swaps	4,344	2,487
Futures	0	0
Total	42,735	44,123
Net amounts of recognized Liabilities
FX swaps	5,813	1,490
Forwards	525	419
Futures	794	940
Contingent consideration	27,854	29,756
Total	34,986	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	(119)	(60)
FX swaps	(240)	(538)
Futures	(115,645)	(70,497)
Total	(116,004)	(71,095)
Net amounts of recognized Liabilities
FX swaps	(240)	(538)
Forwards	(119)	(60)
Futures	(115,645)	(70,497)
Contingent consideration	0	0
Total	(116,004)	(71,095)
Level 1
Net amounts of recognized assets
Marketable securities	402	406
Securities owned—Government debt	33,831	40,602
Securities owned—Equities	685	235
Securities owned—Corporate bonds	0	0
Forwards	0	0
FX swaps	0	0
Futures	0	0
Total	34,918	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	2,997	1
Forwards	595	452
FX swaps	4,584	3,025
Futures	115,645	70,497
Total	123,821	73,975
Net amounts of recognized Liabilities
FX swaps	6,053	2,028
Forwards	644	479
Futures	116,439	71,437
Contingent consideration	0	0
Total	123,136	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	27,854	29,756
Total	$ 27,854	$ 29,756

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