Quarterly report pursuant to Section 13 or 15(d)

Schedule of Fair Value of Derivatives Financial Instruments and Senior Notes (Detail)

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Schedule of Fair Value of Derivatives Financial Instruments and Senior Notes (Detail) (Fair Value, Inputs, Level 2, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Inputs, Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives $ 867  
8.50% Senior Notes      
Revolving bank credit facility      
Derivatives 9,365 9,401
8.50% Senior Notes 976,500 963,000
Revolving bank credit facility $ 143,000 $ 170,000