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Clawback Obligations by Segment (Detail) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2019	Dec. 31, 2018
Product Liability Contingency [Line Items]
Clawback obligations		$ 70,072	$ 29,521
Blackstone Holdings
Product Liability Contingency [Line Items]
Clawback obligations		69,215	30,421
Current And Former Blackstone Personnel
Product Liability Contingency [Line Items]
Clawback obligations	[1]	857	(900)
Real Estate Segment
Product Liability Contingency [Line Items]
Clawback obligations		25,193	25,823
Real Estate Segment | Blackstone Holdings
Product Liability Contingency [Line Items]
Clawback obligations		15,373	15,770
Real Estate Segment | Current And Former Blackstone Personnel
Product Liability Contingency [Line Items]
Clawback obligations	[1]	9,820	10,053
Private Equity Segment
Product Liability Contingency [Line Items]
Clawback obligations		42,042	848
Private Equity Segment | Blackstone Holdings
Product Liability Contingency [Line Items]
Clawback obligations		52,493	13,296
Private Equity Segment | Current And Former Blackstone Personnel
Product Liability Contingency [Line Items]
Clawback obligations	[1]	(10,451)	(12,448)
Credit Segment
Product Liability Contingency [Line Items]
Clawback obligations		2,837	2,850
Credit Segment | Blackstone Holdings
Product Liability Contingency [Line Items]
Clawback obligations		1,349	1,355
Credit Segment | Current And Former Blackstone Personnel
Product Liability Contingency [Line Items]
Clawback obligations	[1]	$ 1,488	$ 1,495
[1] The split of clawback between Blackstone Holdings and Current and Former Personnel is based on the performance of individual investments held by a fund rather than on a fund by fund basis.

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- Definition

Amount of increase (decrease) in loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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