Reconciliation of Total Segments to Income Before Provision for Taxes and Total Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Fund Management Fees and Performance Fees Eliminated in Consolidation and Transactional Investment Loss	$ (2,757)	$ (3,711)
Fund Expenses Added in Consolidation	(5,847)	9,367
Non-Controlling Interests in Income of Consolidated Entities	33,685	89,323
Transaction-Related Other Loss	(5,939)	(1,424)
Total Other Income	19,142	93,555
Economic Income	387,445	1,631,783
Amortization of Intangibles	(23,208)	(25,899)
IPO and Acquisition-Related Charges	(64,136)	(231,862)
Non-Controlling Interests in Income of Consolidated Entities	33,685	89,323
Total Consolidation Adjustments and Reconciling Items	(53,659)	(168,438)
Income Before Provision for Taxes	$ 333,786	$ 1,463,345