Performance Fees Allocated to Funds (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2014	$ 6,337,045
Performance Fees Allocated as a Result of Changes in Fund Fair Values	2,146,905
Foreign Exchange Loss	(20,380)
Fund Distributions	(2,135,335)
Performance Fees, June 30, 2015	6,328,235
Private Equity Segment
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2014	2,215,584
Performance Fees Allocated as a Result of Changes in Fund Fair Values	1,190,791
Fund Distributions	(922,310)
Performance Fees, June 30, 2015	2,484,065
Real Estate Segment
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2014	3,721,751
Performance Fees Allocated as a Result of Changes in Fund Fair Values	836,288
Foreign Exchange Loss	(20,380)
Fund Distributions	(1,149,900)
Performance Fees, June 30, 2015	3,387,759
Hedge Fund Solutions Segment
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2014	15,031
Performance Fees Allocated as a Result of Changes in Fund Fair Values	32,205
Fund Distributions	(12,526)
Performance Fees, June 30, 2015	34,710
Credit Segment
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Performance Fees, December 31, 2014	384,679
Performance Fees Allocated as a Result of Changes in Fund Fair Values	87,621
Fund Distributions	(50,599)
Performance Fees, June 30, 2015	$ 421,701