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Noninterest Income - Summary of Other Noninterest Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Trading Activity, Gains and Losses, Net [Line Items]        
Revenue from contracts with customers $ 130,437   $ 364,258  
Net gains on revaluation of foreign currency instruments, net of foreign exchange forward contracts 796 $ (100) 985 $ 1,455
Other service revenue 5,747 10,798 20,542 23,770
Other 12,022 15,896 38,671 41,128
Fund management fees        
Trading Activity, Gains and Losses, Net [Line Items]        
Revenue from contracts with customers $ 5,479 $ 5,198 $ 17,144 $ 15,903