Unvested Units, After Expected Forfeitures (Detail)	3 Months Ended
	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Blackstone Holdings Partnership Units (Units)	43,437,445
Deferred Restricted Blackstone Common Units	16,159,235
Total Equity-Based Awards (Units)	59,596,680
Phantom Units (Units)	147,319
Blackstone Holdings Partnership Units (Weighted-Average Service Period in Years)	1 year 8 months 12 days
Deferred Restricted Blackstone Common Units	2 years 3 months 18 days
Total Equity-Based Awards (Weighted-Average Service Period in Years)	1 year 9 months 18 days
Phantom Units (Weighted-Average Service Period in Years)	11 days