Unvested Units, After Expected Forfeitures (Detail) |
9 Months Ended |
|---|---|
|
Sep. 30, 2015
shares
| |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Blackstone Holdings Partnership Units (Units) | 33,291,174 |
| Deferred Restricted Blackstone Common Units | 12,633,401 |
| Total Equity-Based Awards (Units) | 45,924,575 |
| Phantom Units (Units) | 18,457 |
| Blackstone Holdings Partnership Units (Weighted-Average Service Period in Years) | 4 years 7 months 6 days |
| Deferred Restricted Blackstone Common Units | 2 years 1 month 6 days |
| Total Equity-Based Awards (Weighted-Average Service Period in Years) | 3 years 10 months 24 days |
| Phantom Units (Weighted-Average Service Period in Years) | 4 years |