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Information Concerning Guarantor and Non-Guarantor Subsidiaries - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Guarantors [Member]
Entity
Sep. 30, 2014
5% Senior Notes [Member]
Dec. 31, 2013
5% Senior Notes [Member]
Sep. 30, 2014
$1 Billion Credit Facility [Member]
Dec. 31, 2013
$1 Billion Credit Facility [Member]
Sep. 30, 2014
$400 Million Term Loan Facility [Member]
Dec. 31, 2013
$400 Million Term Loan Facility [Member]
Condensed Financial Statements, Captions [Line Items]                
Interest rate of Senior Notes     5.00% 5.00%        
Number of wholly owned subsidiaries   4            
Total credit facility         $ 1,000,000,000 $ 1,000,000,000 $ 400,000,000   
Ownership percentage in subsidiaries 100.00%