Other Noninterest Income (Loss) and Other Noninterest Expense - Summary of Other Noninterest Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Income and Expenses [Abstract]
Fund management fees	$ 15,941	$ 13,498	$ 11,163
Service-based fee income	9,172	8,801	7,807
Net losses on the sale of certain assets related to our SVBIF business	0	(13,934)	0
(Losses) gains on revaluation of foreign currency instruments	(12,735)	(21,636)	3,016
Other	21,784	12,011	14,153
Total other noninterest income	$ 34,162	$ (1,260)	$ 36,139