Basic and Diluted Net Income Per Common Unit (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Line Items]
Net Income for Per Common Unit Calculation		644,897,849	625,276,969
Net Income Attributable to The Blackstone Group L.P., Basic		$ 150,033	$ 629,448
Incremental Net Income from Assumed Exchange of Blackstone Holdings Partnership Units		119,594
Net Income Attributable to The Blackstone Group L.P., Diluted		$ 269,627	$ 629,448
Weighted-Average Common Units Outstanding, Basic		644,897,849	625,276,969
Weighted-Average Unvested Deferred Restricted Common Units		1,629,702	5,955,072
Weighted-Average Blackstone Holdings Partnership Units		548,042,780
Weighted-Average Common Units Outstanding, Diluted		1,194,570,331	631,232,041
Net Income Per Common Unit, Basic		$ 0.23	$ 1.01
Net Income Per Common Unit, Diluted		0.23	1.00
Distributions Declared Per Common Unit	[1]	$ 0.61	$ 0.78

[1] Distributions declared reflects the calendar date of the declaration for each distribution.