Performance Fees Allocated to Funds (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2012	$ 2,780,217
Performance Fees Allocated as a Result of Changes in Fund Fair Values	1,578,628
Foreign Exchange Gain	2,540
Fund Distributions	(655,672)
Performance Fees, September 30, 2013	3,705,713
Private Equity
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2012	780,474
Performance Fees Allocated as a Result of Changes in Fund Fair Values	165,884
Fund Distributions	(223,502)
Performance Fees, September 30, 2013	722,856
Real Estate
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2012	1,633,279
Performance Fees Allocated as a Result of Changes in Fund Fair Values	1,156,423
Foreign Exchange Gain	2,540
Fund Distributions	(273,755)
Performance Fees, September 30, 2013	2,518,487
Hedge Fund Solutions
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2012	6,214
Performance Fees Allocated as a Result of Changes in Fund Fair Values	45,520
Fund Distributions	(10,875)
Performance Fees, September 30, 2013	40,859
Credit
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2012	360,250
Performance Fees Allocated as a Result of Changes in Fund Fair Values	210,801
Fund Distributions	(147,540)
Performance Fees, September 30, 2013	$ 423,511