v2.4.0.8
Related Party Transactions - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
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 43,900,000 46,800,000 144,500,000 90,200,000  
Management and Advisory Fees, Net from Affiliates 48,900,000 49,000,000 169,000,000 153,100,000  
Interest from loans to affiliates 900,000 1,100,000 2,700,000 3,300,000  
Partnership Unit to Blackstone Common Unit ratio     1    
Cash saving in tax receivable agreements, percentage     85.00%    
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 $ 396,100,000   $ 396,100,000    
After-tax net present value discount rate assumption 15.00%   15.00%