Unvested Units, After Expected Forfeitures (Detail)	3 Months Ended
	Mar. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Blackstone Holdings Partnership Units (Units)	29,122,600
Deferred Restricted Blackstone Common Units	11,561,529
Total Equity-Based Awards (Units)	40,684,129
Phantom Units (Units)	22,284
Blackstone Holdings Partnership Units (Weighted-Average Service Period in Years)	4 years 4 months 24 days
Deferred Restricted Blackstone Common Units	2 years
Total Equity-Based Awards (Weighted-Average Service Period in Years)	3 years 8 months 12 days
Phantom Units (Weighted-Average Service Period in Years)	3 years 6 months