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Summary of Aggregate Notional Amount and Fair Value of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional $ 1,788,783 $ 719,650
Derivative Liabilities, Notional 2,092,823 1,425,901
Derivative Assets, Fair Value 6,048 15,009
Derivative Liabilities, Fair Value 30,769 30,528
Net Investment Hedges | Foreign Currency Contracts    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 140 62,078
Derivative Liabilities, Notional 56,008  
Derivative Assets, Fair Value   523
Derivative Liabilities, Fair Value 244  
Freestanding Derivatives    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 1,788,643 657,572
Derivative Liabilities, Notional 2,036,815 1,425,901
Derivative Assets, Fair Value 6,048 14,486
Derivative Liabilities, Fair Value 30,525 30,528
Freestanding Derivatives | Credit Default Swap    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Fair Value   85
Derivative Liabilities, Fair Value 6,413 868
Freestanding Derivatives | Blackstone - Other | Credit Default Swap    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional   19,500
Derivative Liabilities, Notional 74,000 56,000
Derivative Assets, Fair Value   85
Derivative Liabilities, Fair Value 6,413 868
Freestanding Derivatives | Investments Of Consolidated Blackstone Funds | Credit Default Swap    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities, Notional 87,088 91,372
Derivative Liabilities, Fair Value 4,454 2,514
Freestanding Derivatives | Foreign Currency Contracts | Blackstone - Other    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 181,335 192,163
Derivative Liabilities, Notional 210,855 148,873
Derivative Assets, Fair Value 2,443 2,798
Derivative Liabilities, Fair Value 1,849 681
Freestanding Derivatives | Foreign Currency Contracts | Investments Of Consolidated Blackstone Funds    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 97,169 199,364
Derivative Liabilities, Notional 107,632 250,244
Derivative Assets, Fair Value 2,345 8,915
Derivative Liabilities, Fair Value 5,975 21,875
Freestanding Derivatives | Interest Rate Contracts | Blackstone - Other    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 1,510,139 223,886
Derivative Liabilities, Notional 1,557,240 879,412
Derivative Assets, Fair Value 1,260 407
Derivative Liabilities, Fair Value $ 11,834 4,590
Freestanding Derivatives | Interest Rate Contracts | Investments Of Consolidated Blackstone Funds    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional   22,659
Derivative Assets, Fair Value   $ 2,281