Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015	[1]	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Quarterly Financial Information [Line Items]
Revenues	$ 897,419		$ 11,573		$ 1,225,202		$ 2,512,358		$ 2,020,774		$ 1,679,426		$ 2,257,860		$ 1,526,668		$ 4,646,552		$ 7,484,728		$ 6,613,168
Expenses	556,878		476,997		914,432		1,142,568		823,086		1,055,138		1,089,781		887,851		3,090,875		3,855,856		3,866,740
Other Income	100,368		(16,867)		82,015		93,555		140,432		8,682		138,585		70,155		259,071		357,854		402,133
Income (Loss) Before Provision for Taxes	440,909		(482,291)		392,785		1,463,345		1,338,120		632,970		1,306,664		708,972		1,814,748		3,986,726		3,148,561
Net Income	394,679		(483,864)		349,534		1,364,001		1,263,434		553,862		1,223,382		654,875		1,624,350		3,695,553		2,892,919
Net Income (Loss) Attributable to The Blackstone Group L.P.	$ 200,870		$ (254,697)		$ 134,168		$ 629,448		$ 551,451		$ 250,505		$ 517,016		$ 265,617		$ 709,789		$ 1,584,589		$ 1,171,202
Net Income (Loss) Per Common Unit
Common Units, Basic	$ 0.31		$ (0.40)		$ 0.21		$ 1.01		$ 0.90		$ 0.41		$ 0.85		$ 0.44		$ 1.12		$ 2.60		$ 2.00
Common Units, Diluted	0.23		(0.40)		0.21		1.00		0.89		0.41		0.85		0.44		1.04		2.58		1.98
Distributions Declared	$ 0.49	[2]	$ 0.74	[2]	$ 0.89	[2]	$ 0.78	[2]	$ 0.44	[2]	$ 0.55	[2]	$ 0.35	[2]	$ 0.58	[2]	$ 2.90	[3]	$ 1.92	[3]	$ 1.18	[3]

[1] Blackstone adopted new GAAP consolidation guidance for the quarter ended June 30, 2015 and applied a modified retrospective approach as of January 1, 2015. Adoption did not change Net Income Attributable to The Blackstone Group L.P. for the quarter ended March 31, 2015, but did change Revenues, Expenses, Other Income (Loss), Income (Loss) Before Provision for Taxes and Net Income (Loss). Such amounts have been recast here from the amounts originally reported for the quarter ended March 31, 2015.

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

[3] Distributions declared reflects the calendar date of declaration for each distribution. The fourth quarter distribution, if any, for any fiscal year will be declared and paid in the subsequent fiscal year.