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Summary of Aggregate Notional Amount and Fair Value of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional $ 1,155,205 $ 1,071,169
Derivative Liabilities, Notional 1,339,510 2,190,208
Derivative Assets, Fair Value 40,052 32,787
Derivative Liabilities, Fair Value 67,144 41,798
Net Investment Hedges | Foreign Currency Contracts    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities, Notional   50,857
Derivative Liabilities, Fair Value   453
Freestanding Derivatives    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 1,155,205 1,071,169
Derivative Liabilities, Notional 1,339,510 2,139,351
Derivative Assets, Fair Value 40,052 32,787
Derivative Liabilities, Fair Value 67,144 41,345
Freestanding Derivatives | Blackstone | Credit Default Swap    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional   2,073
Derivative Liabilities, Notional 28,509 2,073
Derivative Assets, Fair Value   304
Derivative Liabilities, Fair Value 1,687 304
Freestanding Derivatives | Consolidated Blackstone Funds | Credit Default Swap    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 22,961 45,670
Derivative Liabilities, Notional 50,242 45,582
Derivative Assets, Fair Value 170 3,731
Derivative Liabilities, Fair Value 3,599 5,163
Freestanding Derivatives | Consolidated Blackstone Funds | Total Return Swaps    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 31,492 25,645
Derivative Assets, Fair Value 233 526
Freestanding Derivatives | Foreign Currency Contracts | Blackstone    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 26,614 279,050
Derivative Liabilities, Notional 327,124 296,252
Derivative Assets, Fair Value 961 2,097
Derivative Liabilities, Fair Value 2,190 2,975
Freestanding Derivatives | Foreign Currency Contracts | Consolidated Blackstone Funds    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 107,009 493,181
Derivative Liabilities, Notional 25,081 264,693
Derivative Assets, Fair Value 1,906 24,087
Derivative Liabilities, Fair Value 1,504 5,628
Freestanding Derivatives | Interest Rate Contracts | Blackstone    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 967,128 225,550
Derivative Liabilities, Notional 908,553 1,530,751
Derivative Assets, Fair Value 36,660 2,042
Derivative Liabilities, Fair Value 58,097 $ 27,275
Freestanding Derivatives | Equity Options    
Derivatives, Fair Value [Line Items]    
Derivative Assets, Notional 1  
Derivative Liabilities, Notional 1  
Derivative Assets, Fair Value 122  
Derivative Liabilities, Fair Value $ 67