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Information Concerning Guarantor and Non-Guarantor Subsidiaries - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2014
Guarantors [Member]
Entity
Mar. 31, 2014
5% Senior Notes [Member]
Dec. 31, 2013
5% Senior Notes [Member]
Mar. 31, 2014
$1 Billion Credit Facility [Member]
Dec. 31, 2013
$1 Billion Credit 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 $ 1,000,000
Ownership percentage in subsidiaries 100.00%