Segment Operating Results Revenues Derived from Clients and Private Equity Funds by Geographical Areas (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net revenue	$ 1,228,989	$ 920,110	$ 762,565
United States [Member]
Segment Reporting Information [Line Items]
Net revenue	900,672	608,631	532,615
Europe And Other [Member]
Segment Reporting Information [Line Items]
Net revenue	287,884	248,815	145,267
Latin America [Member]
Segment Reporting Information [Line Items]
Net revenue	$ 40,433	$ 62,664	$ 84,683