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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
Jul. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Other Noncurrent Assets      
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]      
Unamortized debt issuance costs   $ 9,100,000 $ 9,500,000
Amended Revolving Credit Facility      
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]      
Line of credit facility maximum borrowing capacity $ 900,000,000 $ 900,000,000