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Performance Fees Allocated to Funds (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Beginning Balance	$ 20,377,031
Ending Balance	22,242,040
Performance Fees
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Beginning Balance	5,883,924
Performance Allocations as a Result of Changes in Fund Fair Values	1,443,621
Foreign Exchange Loss	(3,300)
Fund Distributions	(580,703)
Ending Balance	6,743,542
Real Estate Segment | Performance Fees
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Beginning Balance	2,853,261
Performance Allocations as a Result of Changes in Fund Fair Values	832,342
Foreign Exchange Loss	(3,300)
Fund Distributions	(268,978)
Ending Balance	3,413,325
Private Equity Segment | Performance Fees
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Beginning Balance	2,642,119
Performance Allocations as a Result of Changes in Fund Fair Values	435,425
Fund Distributions	(291,911)
Ending Balance	2,785,633
Hedge Fund Solutions Segment | Performance Fees
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Beginning Balance	22,921
Performance Allocations as a Result of Changes in Fund Fair Values	70,690
Fund Distributions	(1,605)
Ending Balance	92,006
Credit Segment | Performance Fees
Schedule of Performance Fees and Allocations to the General Partner [Line Items]
Beginning Balance	365,623
Performance Allocations as a Result of Changes in Fund Fair Values	105,164
Fund Distributions	(18,209)
Ending Balance	$ 452,578

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(h))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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