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Supplemental Guarantor Information - Additional Information (Detail) - USD ($)
Sep. 30, 2015
May. 31, 2015
Non-Guarantor Subsidiaries | Maximum [Member]    
Condensed Financial Statements Captions [Line Items]    
Percentage of Non Guarantor Subsidiaries 3.00%  
550 million revolving credit facility [Member]    
Condensed Financial Statements Captions [Line Items]    
Unsecured revolving credit facility $ 550,000,000 $ 550,000,000