Segment Operating Results Revenues Derived from Clients and Private Equity Funds by Geographical Areas (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Net revenue	$ 349,429	$ 271,055	$ 608,484	$ 510,774
United States [Member]
Segment Reporting Information [Line Items]
Net revenue	218,945	203,186	392,855	365,008
Europe And Other [Member]
Segment Reporting Information [Line Items]
Net revenue	120,470	56,927	192,681	128,138
Latin America [Member]
Segment Reporting Information [Line Items]
Net revenue	$ 10,014	$ 10,942	$ 22,948	$ 17,628