Quarterly Financial Data (Detail) (USD $) In Thousands, except Per 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
Quarterly Financial Information [Line Items]
Revenues	$ 2,709,380		$ 1,216,845		$ 1,440,470		$ 1,246,473		$ 1,217,113		$ 1,223,089		$ 627,203		$ 952,036		$ 6,613,168	$ 4,019,441	$ 3,252,576
Expenses	1,330,472		786,405		914,762		835,101		885,679		851,390		739,819		783,793		3,866,740	3,260,681	3,388,069
Other Income (Loss)	206,005		87,952		40,966		67,210		(144,267)		(135,960)		248,230		288,142		402,133	256,145	212,751
Income Before Provision for Taxes	1,584,913		518,392		566,674		478,582		187,167		235,739		135,614		456,385		3,148,561	1,014,905	77,258
Net Income (Loss)	1,493,823		460,915		510,592		427,589		121,471		196,502		94,277		417,632		2,892,919	829,882	(268,453)
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)
Net Income (Loss) Per Common Unit - Basic and Diluted
Common Units-Basic	$ 1.05		$ 0.29		$ 0.36		$ 0.29		$ 0.19		$ 0.24		$ (0.14)		$ 0.12		$ 2.00	$ 0.41	$ (0.35)
Common Units-Diluted	$ 1.04		$ 0.29		$ 0.36		$ 0.29		$ 0.19		$ 0.24		$ (0.14)		$ 0.11		$ 1.98	$ 0.41	$ (0.35)
Distributions Declared	$ 0.23	[1]	$ 0.23	[1]	$ 0.30	[1]	$ 0.42	[1]	$ 0.10	[1]	$ 0.10	[1]	$ 0.10	[1]	$ 0.22	[1]

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