Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Founder's, other senior managing directors' and employees' investments	$ 1,000,000,000		$ 1,000,000,000	$ 939,400,000
Founder's, other senior managing directors' and employees' share of the Net Income Attributable to Redeemable Non-Controlling Interests			224,700,000	114,100,000	109,400,000
Management and Advisory Fees, Net from Affiliates			253,900,000	254,700,000	317,700,000
Interest from loans to affiliates			3,400,000	4,400,000	3,700,000
Partnership Unit to Blackstone Common Unit ratio			1
Cash saving in tax receivable agreements, percentage			85.00%
Reduction in due to pre IPO owners and others resulted from change in effective tax rate of corporate tax payers	20,500,000	197,800,000
Expected future payments under the tax receivable agreements	1,200,000,000		1,200,000,000
Expected future payments under the tax receivable agreements in years	15 years		15 years
After-tax net present value estimated payments	407,400,000		407,400,000
After-tax net present value discount rate assumption	15.00%		15.00%
Payments made under tax receivable agreements and related tax benefits				$ 80,600,000