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Information Concerning Guarantor and Non-Guarantor Subsidiaries - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended 6 Months Ended
Jun. 30, 2013
Apr. 18, 2013
Jun. 30, 2013
Guarantors [Member]
Entity
Jun. 30, 2013
5% Senior Notes [Member]
Apr. 30, 2013
5% Senior Notes [Member]
Jun. 30, 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   $ 925.0       $ 1,000.0
Ownership percentage in subsidiaries 100.00%          
Year of formation of operating partnership and certain subsidiary guarantors 2012