Carried Interest Receivable - Carried Interest Receivable Balance (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Receivables [Line Items]
Carried interest receivable, Beginning Balance	$ 1,878,256
Change in fair value of funds	1,368,995
Fund cash distributions to the Company	(1,232,506)
Carried Interest Receivable, Ending Balance	2,014,745
Private Equity Segment [Member]
Receivables [Line Items]
Carried interest receivable, Beginning Balance	1,413,306
Change in fair value of funds	1,219,583
Fund cash distributions to the Company	(1,031,636)
Carried Interest Receivable, Ending Balance	1,601,253
Credit Segment [Member]
Receivables [Line Items]
Carried interest receivable, Beginning Balance	454,155
Change in fair value of funds	154,741
Fund cash distributions to the Company	(200,014)
Carried Interest Receivable, Ending Balance	408,882
Real Estate [Member]
Receivables [Line Items]
Carried interest receivable, Beginning Balance	10,795
Change in fair value of funds	(5,329)
Fund cash distributions to the Company	(856)
Carried Interest Receivable, Ending Balance	$ 4,610