Condensed Consolidating Guarantor Financial Statements - Additional information (Detail)	9 Months Ended
	Sep. 30, 2013
Condensed Financial Statements, Captions [Line Items]
Ownership percentage	100.00%
2017 and 2018 Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Dividend payment threshold of percentage of future net income	50.00%