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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, 2018
Dec. 31, 2017
Net amounts of recognized assets    
Loans held for sale, at fair value, Assets $ 965,639 $ 362,635
Marketable securities, Assets 96,061 208,176
Government debt, Assets 88,577 32,744
Securities owned - Equities, Assets 780 263
Forwards, Assets 9,888 4,262
Rate lock commitments, Assets 8,750 2,923
Foreign exchange/commodities options, Assets 3,931 4,416
Futures, Assets 1,233 25
Foreign exchange swaps, Assets 943 801
Interest rate swaps, Assets   242
Total, Assets 1,175,802 616,487
Net amounts of recognized Liabilities    
Rate lock commitments, Liabilities 8,980 2,390
Forwards, Liabilities 2,636 1,483
Futures, Liabilities 810 1,066
Foreign exchange swaps, Liabilities 727 2,846
Foreign exchange/commodities options, Liabilities   130
Equity options, Liabilities   18
Contingent consideration, Liabilities 59,242 67,172
Total, Liabilities 72,395 75,105
Netting and Collateral [Member]    
Net amounts of recognized assets    
Forwards, Assets (12) (101)
Foreign exchange/commodities options, Assets (98,736) (27,418)
Futures, Assets (42,308) (78,944)
Foreign exchange swaps, Assets (306) (334)
Total, Assets (141,362) (106,797)
Net amounts of recognized Liabilities    
Forwards, Liabilities (12) (101)
Futures, Liabilities (42,308) (78,944)
Foreign exchange swaps, Liabilities (306) (334)
Foreign exchange/commodities options, Liabilities (98,736) (27,418)
Total, Liabilities (141,362) (106,797)
Level 1 [Member]    
Net amounts of recognized assets    
Marketable securities, Assets 96,061 208,176
Government debt, Assets 88,577 32,744
Securities owned - Equities, Assets 780 263
Foreign exchange/commodities options, Assets 102,667 31,834
Total, Assets 288,085 273,017
Net amounts of recognized Liabilities    
Foreign exchange/commodities options, Liabilities 98,736 27,548
Equity options, Liabilities   18
Total, Liabilities 98,736 27,566
Level 2 [Member]    
Net amounts of recognized assets    
Loans held for sale, at fair value, Assets 965,639 362,635
Forwards, Assets 213 610
Futures, Assets 43,541 78,969
Foreign exchange swaps, Assets 1,249 1,135
Interest rate swaps, Assets   242
Total, Assets 1,010,642 443,591
Net amounts of recognized Liabilities    
Forwards, Liabilities 227 927
Futures, Liabilities 43,118 80,010
Foreign exchange swaps, Liabilities 1,033 3,180
Total, Liabilities 44,378 84,117
Level 3 [Member]    
Net amounts of recognized assets    
Forwards, Assets 9,687 3,753
Rate lock commitments, Assets 8,750 2,923
Total, Assets 18,437 6,676
Net amounts of recognized Liabilities    
Rate lock commitments, Liabilities 8,980 2,390
Forwards, Liabilities 2,421 657
Contingent consideration, Liabilities 59,242 67,172
Total, Liabilities $ 70,643 $ 70,219