Other Noninterest Income and Other Noninterest Expense - Summary of Other Noninterest Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Income and Expenses [Abstract]
Fund management fees	$ 4,298	$ 3,861	$ 8,918	$ 7,583
Service-based fee income	2,148	2,413	4,240	4,519
(Losses) gains on revaluation of internal foreign currency instruments, net (1)	(5,307)	8,306	(2,816)	(11,853)
Other (2)	5,115	4,336	11,883	10,989
Total other noninterest income	$ 6,254	$ 18,916	$ 22,225	$ 11,238