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Commitments and Contingencies - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Schedule Of Commitments And Contingencies [Line Items]
General partner capital funding	$ 3,300.0
Total investments at risk in respect of guarantees extended	$ 33.1
Contingent obligations currently anticipated to expire end	2028
Provision for cash clawback	$ 703.6
Contingent Obligations (Clawback)	6,900.0
Blackstone Holdings
Schedule Of Commitments And Contingencies [Line Items]
Loans held By employees for investment guaranteed	179.2
Contingent Obligations (Clawback)	6,300.0
Consolidated Blackstone Funds
Schedule Of Commitments And Contingencies [Line Items]
Funds signed investment commitments	116.3
Consolidated Blackstone Funds | Portfolio Company Acquisition
Schedule Of Commitments And Contingencies [Line Items]
Signed investment commitments for portfolio company acquisitions in process of closing	$ 58.4

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