Reconciliation of Total Segments to Income Before Provision for Taxes and Total Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Fund Management Fees and Performance Fees Eliminated in Consolidation and Transactional Investment Loss	$ (31,781)	$ (21,040)	$ (35,492)	$ (38,918)
Fund Expenses Added in Consolidation	33,677	765	43,044	19
Non-Controlling Interests in Income of Consolidated Entities	80,496	162,547	169,819	252,300
Transaction-Related Other Income/Loss	(377)	(3,687)	(1,801)	(4,661)
Total Other Income	82,015	138,585	175,570	208,740
Economic Income	529,027	1,350,995	2,160,810	2,176,241
Amortization of Intangibles	(24,720)	(28,310)	(50,619)	(57,313)
IPO and Acquisition-Related Charges	(192,018)	(178,568)	(423,880)	(355,592)
Non-Controlling Interests in Income of Consolidated Entities	80,496	162,547	169,819	252,300
Total Consolidation Adjustments and Reconciling Items	(136,242)	(44,331)	(304,680)	(160,605)
Income Before Provision for Taxes	$ 392,785	$ 1,306,664	$ 1,856,130	$ 2,015,636