Commitments and Contingencies - Additional Information (Detail) $ in Millions |
9 Months Ended |
|---|---|
|
Sep. 30, 2015
USD ($)
| |
| Schedule Of Commitments And Contingencies [Line Items] | |
| General partner capital funding | $ 2,200.0 |
| Total investments at risk in respect of guarantees extended | $ 24.0 |
| Contingent obligations currently anticipated to expire end | 2016 |
| Provision for cash clawback | $ 551.6 |
| Blackstone Holdings Finance Co. L.L.C. | |
| Schedule Of Commitments And Contingencies [Line Items] | |
| Loans held By employees for investment guaranteed | 117.0 |
| Blackstone Funds | |
| Schedule Of Commitments And Contingencies [Line Items] | |
| Funds signed investment commitments | 34.9 |
| Blackstone Funds | Portfolio Company Acquisition | |
| Schedule Of Commitments And Contingencies [Line Items] | |
| Signed investment commitments for portfolio company acquisitions in process of closing | $ 22.9 |