Segment Operating Results Revenues Derived from Clients and Private Equity Funds by Geographical Areas (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Segment Reporting Information [Line Items]
Net revenue	$ 226,955	[1]	$ 188,213	[1]	$ 596,426	[1]	$ 549,576	[1]
United States [Member]
Segment Reporting Information [Line Items]
Net revenue	127,478	[1]	131,499	[1]	377,907	[1]	379,950	[1]
Europe and Other [Member]
Segment Reporting Information [Line Items]
Net revenue	89,146	[1]	37,465	[1]	173,931	[1]	112,331	[1]
Latin America [Member]
Segment Reporting Information [Line Items]
Net revenue	$ 10,331	[1]	$ 19,249	[1]	$ 44,588	[1]	$ 57,295	[1]

[1] Excludes Other Revenue and Interest Expense.