Segment Operating Results - Revenues Derived from Clients and Private Equity Funds by Geographical Areas (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net revenue	$ 388,284	$ 259,055
United States [Member]
Segment Reporting Information [Line Items]
Net revenue	263,165	173,910
Europe and Other [Member]
Segment Reporting Information [Line Items]
Net revenue	122,911	72,211
Latin America [Member]
Segment Reporting Information [Line Items]
Net revenue	$ 2,208	$ 12,934