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, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016
Segment Reporting Information [Line Items]
Fund Management Fees and Performance Fees Eliminated in Consolidation and Transactional Investment Income (Loss)	$ (51,984)		$ (37,835)		$ (174,261)		$ (68,308)
Fund Expenses Added in Consolidation	931		5,141		39,334		(4,016)
Income Associated with Non-Controlling Interests of Consolidated Entities	116,661		93,417		371,281		189,782
Transaction-Related Other Income (Loss)	(2,160)		672		3,280		(6,218)
Total Other Income	63,448		61,395		239,634		111,240
Amortization of Intangibles	(11,344)		(22,054)		(34,032)		(68,470)
Transaction-Related Charges	(55,714)		(60,029)		(170,524)		(194,121)
Income Associated with Non-Controlling Interests of Consolidated Entities	116,661		93,417		371,281		189,782
Economic Income	906,465		719,303		2,757,967		1,563,615
Operating Segments
Segment Reporting Information [Line Items]
Economic Income	856,862		707,969		2,591,242		1,636,424
Consolidation Adjustments and Reconciling Items
Segment Reporting Information [Line Items]
Total Other Income	63,448	[1]	61,395	[1]	239,634	[2]	111,240	[2]
Economic Income	$ 49,603	[3]	$ 11,334	[3]	$ 166,725	[4]	$ (72,809)	[4]

[1] The Other Income adjustment results from the following: Three Months Ended September 30, 2017 2016 Fund Management Fees and Performance Fees Eliminated in Consolidation and Transactional Investment Loss $ (51,984 ) $ (37,835 ) Fund Expenses Added in Consolidation 931 5,141 Income Associated with Non-Controlling Interests of Consolidated Entities 116,661 93,417 Transaction-Related Other Income (Loss) (2,160 ) 672 Total Consolidation Adjustments and Reconciling Items $ 63,448 $ 61,395

[2] The Other Income adjustment results from the following: Nine Months Ended September 30, 2017 2016 Fund Management Fees and Performance Fees Eliminated in Consolidation and Transactional Investment Loss $ (174,261 ) $ (68,308 ) Fund Expenses Added in Consolidation 39,334 (4,016 ) Income Associated with Non-Controlling Interests of Consolidated Entities 371,281 189,782 Transaction-Related Other Income (Loss) 3,280 (6,218 ) Total Consolidation Adjustments and Reconciling Items $ 239,634 $ 111,240

[3] The reconciliation of Economic Income to Income Before Provision for Taxes as reported in the Condensed Consolidated Statements of Operations consists of the following: Three Months Ended September 30, 2017 2016 Economic Income $ 856,862 $ 707,969 Adjustments Amortization of Intangibles (11,344 ) (22,054 ) Transaction-Related Charges (55,714 ) (60,029 ) Income Associated with Non-Controlling Interests of Consolidated Entities 116,661 93,417 Total Consolidation Adjustments and Reconciling Items 49,603 11,334 Income Before Provision for Taxes $ 906,465 $ 719,303

[4] The reconciliation of Economic Income to Income Before Provision for Taxes as reported in the Condensed Consolidated Statements of Operations consists of the following: Nine Months Ended September 30, 2017 2016 Economic Income $ 2,591,242 $ 1,636,424 Adjustments Amortization of Intangibles (34,032 ) (68,470 ) Transaction-Related Charges (170,524 ) (194,121 ) Income Associated with Non-Controlling Interests of Consolidated Entities 371,281 189,782 Total Consolidation Adjustments and Reconciling Items 166,725 (72,809 ) Income Before Provision for Taxes $ 2,757,967 $ 1,563,615