v2.4.0.8
Summary of Aggregate Notional Amount and Fair Value of Derivative Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional $ 2,946,033 $ 1,306,817
Derivative Liabilities, Notional 1,495,964 1,035,631
Derivative Assets, Fair Value 44,899 99,374
Derivative Liabilities, Fair Value 14,300 22,070
Freestanding Derivatives | Interest Rate Contracts | Blackstone - Other
   
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 1,994,276 689,300
Derivative Liabilities, Notional 1,083,140 636,555
Derivative Assets, Fair Value 8,521 55,270
Derivative Liabilities, Fair Value 2,676 4,116
Freestanding Derivatives | Interest Rate Contracts | Investments Of Consolidated Blackstone Funds
   
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 62,193 165,517
Derivative Liabilities, Notional   90,500
Derivative Assets, Fair Value 3,726 6,132
Derivative Liabilities, Fair Value   772
Freestanding Derivatives | Foreign Currency Contracts | Blackstone - Other
   
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 166,066 16,771
Derivative Liabilities, Notional 163,787 7,025
Derivative Assets, Fair Value 1,480 74
Derivative Liabilities, Fair Value 1,015 81
Freestanding Derivatives | Foreign Currency Contracts | Investments Of Consolidated Blackstone Funds
   
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 396,569 435,229
Derivative Liabilities, Notional 239,037 301,551
Derivative Assets, Fair Value 30,830 37,898
Derivative Liabilities, Fair Value 10,018 17,101
Freestanding Derivatives | Total Return Swaps | Blackstone - Other
   
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 326,929  
Derivative Assets, Fair Value 342  
Freestanding Derivatives | Credit Default Swaps | Blackstone - Other
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities, Notional 10,000  
Derivative Liabilities, Fair Value $ 591