Reconciliation of Total Segments to Income (Loss) Before Provision for Taxes and Total Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Fund Management Fees and Performance Fees Eliminated in Consolidation and Transactional Investment Loss	$ (37,835)	$ (45,027)	$ (68,308)	$ (80,519)
Fund Expenses Added in Consolidation	5,141	10,175	(4,016)	53,218
Income Associated with Non-Controlling Interests of Consolidated Entities	93,417	18,151	189,782	187,970
Transaction-Related Other Income (Loss)	672	(166)	(6,218)	(1,966)
Other Income (Loss) - Net Gains (Losses) from Fund Investment Activities	61,395	(16,867)	111,240	158,703
Economic Income	707,969	(388,856)	1,636,424	1,771,954
Amortization of Intangibles	(22,054)	(30,624)	(68,470)	(81,243)
Transaction-Related Charges	(60,029)	(80,962)	(194,121)	(504,842)
Income Associated with Non-Controlling Interests of Consolidated Entities	93,417	18,151	189,782	187,970
Total Consolidation Adjustments and Reconciling Items	11,334	(93,435)	(72,809)	(398,115)
Income (Loss) Before Provision (Benefit) for Taxes	$ 719,303	$ (482,291)	$ 1,563,615	$ 1,373,839