Information Concerning Guarantor and Non-Guarantor Subsidiaries - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Apr. 18, 2013
Condensed Financial Statements, Captions [Line Items]
Total credit facility		$ 925.0
Ownership percentage in subsidiaries	100.00%
Year of formation of operating partnership and certain subsidiary guarantors	2012
Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Number of wholly owned subsidiaries	4
5% Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Interest rate of Senior Notes	5.00%
$1 Billion Credit Facility [Member]
Condensed Financial Statements, Captions [Line Items]
Total credit facility	$ 1,000.0