v3.3.0.814
Summary of Anti-Dilutive Securities (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted-Average Unvested Deferred Restricted Common Units 1,913,028 [1] [1] [1]
Blackstone Partnership Units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted-Average Units 550,983,910 539,856,777 551,860,289 544,426,162
[1] These units were dilutive and were included in the diluted per common unit calculation for the applicable period.