Noninterest Income - Summary of Other Noninterest Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Fund management fees	$ 23,016	$ 21,214	$ 19,195
Net gains (losses) on revaluation of foreign currency instruments, net of foreign exchange forward contracts(1)	666	1,788	(1,999)
Other service revenue	28,176	36,108	33,554
Other	$ 51,858	$ 59,110	$ 50,750	[1]

[1] Our consolidated statements of income for the year ended December 31, 2016 was modified from prior periods’ presentation to conform to the current period's presentation, which reflects a new line item to separately disclose net gains on equity warrant assets. In prior periods, net gains on equity warrant assets were reported as a component of net gains on derivative instruments. We removed the line item "gains on derivative instruments, net" and reclassified all other gains on derivative instruments, net to other noninterest income.