Basic and Diluted Net Income Per Common Unit (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Line Items]
Net Income (Loss) Attributable to The Blackstone Group L.P.	$ 621,255	$ 171,164	$ 211,148	$ 167,635	$ 106,413	$ 128,824	$ (74,964)	$ 58,325	$ 1,171,202	$ 218,598	$ (168,303)
Weighted-Average Common Units Outstanding									587,018,828	533,703,606	475,582,718
Basic Net Income (Loss) Per Common Unit	$ 1.05	$ 0.29	$ 0.36	$ 0.29	$ 0.19	$ 0.24	$ (0.14)	$ 0.12	$ 2.00	$ 0.41	$ (0.35)
Weighted-Average Common Units Outstanding									587,018,828	533,703,606	475,582,718
Weighted-Average Unvested Deferred Restricted Common Units									3,527,812	4,965,464
Weighted-Average Diluted Common Units Outstanding									590,546,640	538,669,070	475,582,718
Diluted Net Income (Loss) Per Common Unit	$ 1.04	$ 0.29	$ 0.36	$ 0.29	$ 0.19	$ 0.24	$ (0.14)	$ 0.11	$ 1.98	$ 0.41	$ (0.35)