Performance Fees Allocated to Funds (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2013	$ 4,674,792
Performance Fees Allocated as a Result of Changes in Fund Fair Values	2,935,950
Foreign Exchange Loss	(22,975)
Fund Distributions	(1,465,029)
Performance Fees, September 30, 2014	6,122,738
Private Equity Segment
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2013	971,860
Performance Fees Allocated as a Result of Changes in Fund Fair Values	1,222,677
Fund Distributions	(416,492)
Performance Fees, September 30, 2014	1,778,045
Real Estate Segment
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2013	3,268,606
Performance Fees Allocated as a Result of Changes in Fund Fair Values	1,435,215
Foreign Exchange Loss	(22,975)
Fund Distributions	(836,664)
Performance Fees, September 30, 2014	3,844,182
Hedge Fund Solutions Segment
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2013	9,468
Performance Fees Allocated as a Result of Changes in Fund Fair Values	40,181
Fund Distributions	(18,443)
Performance Fees, September 30, 2014	31,206
Credit Segment
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2013	424,858
Performance Fees Allocated as a Result of Changes in Fund Fair Values	237,877
Fund Distributions	(193,430)
Performance Fees, September 30, 2014	$ 469,305