Performance Fees Allocated to Funds (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 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	520,061
Foreign Exchange Loss	(4,297)
Fund Distributions	(303,076)
Performance Fees, March 31, 2013	2,992,905
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	42,313
Fund Distributions	(138,671)
Performance Fees, March 31, 2013	684,116
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	354,943
Foreign Exchange Loss	(4,297)
Fund Distributions	(79,562)
Performance Fees, March 31, 2013	1,904,363
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	19,915
Fund Distributions	(3,526)
Performance Fees, March 31, 2013	22,603
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	102,890
Fund Distributions	(81,317)
Performance Fees, March 31, 2013	$ 381,823