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Summary of Anti-Dilutive Securities (Detail) (Blackstone Partnership Units)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Blackstone Partnership Units
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted-Average Units 539,856,777 551,916,623 544,426,162 554,857,282