Segment Reporting - Reconciliation of Revenue from Segments to Consolidated (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Revenues:
Advisory and transaction fees from affiliates, net	$ 116,065	$ 47,419
Management fees from affiliates	209,791	150,447
Carried interest income from affiliates	165,544	1,111,207
Total Revenues	491,400	1,309,073
Costs and Expenses	314,119	622,602
Other Income	17,531	1,298
Non-Controlling Interests	(387,475)	(551,087)
Total Assets	22,912,382	21,289,337	22,477,981
Private Equity Funds
Revenues:
Advisory and transaction fees from affiliates, net	37,636	24,617
Management fees from affiliates	79,421	66,272
Carried interest income from affiliates	103,251	990,993
Total Revenues	220,308	1,081,882
Costs and Expenses	131,484	445,535
Other Income	22,093	24,183
Economic Net Income (Loss)	110,917	660,530
Total Assets	2,719,888	3,224,096
Credit Segment
Revenues:
Advisory and transaction fees from affiliates, net	77,480	21,677
Management fees from affiliates	131,629	84,364
Carried interest income from affiliates	66,352	133,775
Total Revenues	275,461	239,816
Costs and Expenses	153,876	119,022
Other Income	43,537	15,417
Non-Controlling Interests	(3,256)	(3,464)
Economic Net Income (Loss)	161,866	132,747
Total Assets	2,075,860	1,807,262
Real Estate
Revenues:
Advisory and transaction fees from affiliates, net	949	1,125
Management fees from affiliates	12,780	13,591
Carried interest income from affiliates	(344)	952
Total Revenues	13,385	15,668
Costs and Expenses	18,081	17,481
Other Income	1,164	1,014
Economic Net Income (Loss)	(3,532)	(799)
Total Assets	187,958	95,795
Total Reportable Segments
Revenues:
Advisory and transaction fees from affiliates, net	116,065	47,419
Management fees from affiliates	223,830	164,227
Carried interest income from affiliates	169,259	1,125,720
Total Revenues	509,154	1,337,366
Costs and Expenses	303,441	582,038
Other Income	66,794	40,614
Non-Controlling Interests	(3,256)	(3,464)
Economic Net Income (Loss)	269,251	792,478
Total Assets	$ 4,983,706	$ 5,127,153