Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Schedule Of Commitments And Contingencies [Line Items]
General partner capital funding	$ 2,200.0
Total investments at risk in respect of guarantees extended	$ 6.3
Contingent obligations currently anticipated to expire end	2028
Provision for cash clawback	$ 576.8
Contingent Obligations (Clawback)	4,600.0
Blackstone Holdings Finance Co. L.L.C.
Schedule Of Commitments And Contingencies [Line Items]
Loans held By employees for investment guaranteed	136.4
Contingent Obligations (Clawback)	4,200.0
Current And Former Blackstone Personnel
Schedule Of Commitments And Contingencies [Line Items]
Contingent Obligations (Clawback)	432.0
Blackstone Funds
Schedule Of Commitments And Contingencies [Line Items]
Funds signed investment commitments	22.9
Blackstone Funds | Portfolio Company Acquisition
Schedule Of Commitments And Contingencies [Line Items]
Signed investment commitments for portfolio company acquisitions in process of closing	$ 10.6