Performance Fees Allocated to Funds (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 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	1,709,362
Foreign Exchange Gain (Loss)	(48,363)
Fund Distributions	(3,240,112)
Performance Fees, December 31, 2015	4,757,932
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	757,001
Fund Distributions	(1,493,142)
Performance Fees, December 31, 2015	1,479,443
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	1,026,731
Foreign Exchange Gain (Loss)	(48,363)
Fund Distributions	(1,598,431)
Performance Fees, December 31, 2015	3,101,688
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	27,916
Fund Distributions	(33,200)
Performance Fees, December 31, 2015	9,747
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	(102,286)
Fund Distributions	(115,339)
Performance Fees, December 31, 2015	$ 167,054