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