v3.3.0.814
Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Related Party Transaction [Line Items]          
Founder's, other senior managing directors' and employees' investments $ 789,600   $ 789,600   $ 1,000,000
Founder's, other senior managing directors' and employees' share of the Net Income (Loss) Attributable to Redeemable Non-Controlling Interests (20,000) $ 40,000 61,100 $ 135,700  
Management and Advisory Fees, Net from Affiliates 48,200 107,615 125,143 262,990  
Interest from loans to affiliates 800 $ 1,000 $ 4,000 $ 2,100  
Partnership Unit to Blackstone Common Unit ratio     100.00%    
Cash saving in tax receivable agreements, percentage     85.00%    
Expected future payments under the tax receivable agreements 1,300,000   $ 1,300,000    
Expected future payments under the tax receivable agreements in years     15 years    
After-tax net present value estimated payments $ 411,700   $ 411,700    
After-tax net present value discount rate assumption 15.00%   15.00%