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Unvested Units, After Expected Forfeitures (Detail)
9 Months Ended
Sep. 30, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Blackstone Holdings Partnership Units (Units) 24,889,558
Deferred Restricted Blackstone Common Units (Units) 7,628,833
Total Equity-Based Awards (Units) 32,518,391
Phantom Units (Units) 38,488
Blackstone Holdings Partnership Units (Weighted-Average Service Period in Years) 3 years 7 months 6 days
Deferred Restricted Blackstone Common Units (Weighted-Average Service in Years) 2 years 4 months 24 days
Total Equity-Based Awards (Weighted-Average Service Period in Years) 3 years 3 months 18 days
Phantom Units (Weighted-Average Service Period in Years) 2 years 8 months 12 days