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Subsequent Events - Additional Information (Detail) - USD ($)
Aug. 28, 2015
Aug. 01, 2015
Jun. 16, 2015
Apr. 25, 2015
Subsequent Event [Line Items]        
Credit facility, borrowed amount   $ 0   $ 0
Unsecured Term Loan [Member] | Credit Agreement [Member]        
Subsequent Event [Line Items]        
Credit facility, borrowed amount     $ 1,000,000,000  
Unsecured Term Loan [Member] | Subsequent Event [Member] | Credit Agreement [Member]        
Subsequent Event [Line Items]        
Credit facility, amount repaid $ 670,000,000      
Credit facility, borrowed amount $ 1,000,000,000