Basic and Diluted Net Income Per Common Unit (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Line Items]
Net Income Attributable to The Blackstone Group L.P.	$ 134,168	$ 517,016	$ 763,616	$ 782,633
Weighted-Average Common Units Outstanding	631,881,205	606,690,740	628,597,331	604,123,284
Basic Net Income Per Common Unit	$ 0.21	$ 0.85	$ 1.21	$ 1.30
Weighted-Average Common Units Outstanding	631,881,205	606,690,740	628,597,331	604,123,284
Weighted-Average Unvested Deferred Restricted Common Units	2,311,444	3,207,089	4,133,258	3,674,476
Weighted-Average Diluted Common Units Outstanding	634,192,649	609,897,829	632,730,589	607,797,760
Diluted Net Income Per Common Unit	$ 0.21	$ 0.85	$ 1.21	$ 1.29