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Investments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Investment [Line Items]          
Investments $ 22,008,182   $ 22,008,182   $ 24,434,049
Recognized net gains related to equity method investments 165,600 $ 124,100 328,100 $ 292,600  
Other Investments          
Investment [Line Items]          
Investments 368,203   368,203   322,474
Equity investments, carrying value 24,500   24,500    
Unrealized gain on investment $ 50,000   $ 50,000    
Patria Investments Limited and Patria Investimentos Ltda.          
Investment [Line Items]          
Equity method investment, percentage 40.00%   40.00%    
Consolidated Blackstone Funds          
Investment [Line Items]          
Investments $ 8,608,565   $ 8,608,565   12,954,121
Consolidated Blackstone Funds | Blackstone          
Investment [Line Items]          
Investments $ 373,500   $ 373,500   $ 488,400