EQUITY - Net Income (Loss) Attributable To Noncontrolling Interests Held by KKR Holdings (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Net Income (Loss)	$ 1,352,269	$ 378,938		$ 3,521,559	$ 2,045,356
Less: Net income (loss) attributable to Redeemable Noncontrolling Interests	12,236	20,876	$ 7,658	19,894	64,196
Less: Net income (loss) attributable to Noncontrolling Interests in consolidated entities	397,835	80,724		1,121,441	500,439
Less: Preferred Stock Dividends	8,341	8,341		25,023	25,023
Plus: Income tax expense (benefit) attributable to KKR Management Holdings Corp.	(131,912)	6,063		(84,947)	30,571
Net income (loss) attributable to KKR & Co. L.P. Common Unitholders and KKR Holdings	801,945	275,060		2,270,254	1,486,269
Net income (loss) attributable to noncontrolling interests				1,985,961
KKR Holdings
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Net income (loss) attributable to noncontrolling interests	$ 293,659	$ 115,434		$ 864,520	$ 637,146