Revenues Derived from Clients and Private Equity Funds by Geographical Areas (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Segment Reporting Information [Line Items]
Net revenue	$ 209,192	[1]	$ 174,462	[1]	$ 362,114	[1]	$ 278,721	[1]
United States [Member]
Segment Reporting Information [Line Items]
Net revenue	157,595		131,406		248,451		201,067
Europe And Other [Member]
Segment Reporting Information [Line Items]
Net revenue	36,146		35,309		75,617		59,631
Latin America [Member]
Segment Reporting Information [Line Items]
Net revenue	$ 15,451		$ 7,747		$ 38,046		$ 18,023

[1] Excludes Other Revenue and Interest Expense.