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Investments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investment [Line Items]      
Equity method investment, percentage 40.00%    
Recognized net gains related to equity method investments $ 591.9 $ 199.7 $ 135.7
Consolidated Blackstone Funds
     
Investment [Line Items]      
Investments $ 487.8 $ 500.5