Annual report pursuant to Section 13 and 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
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Inputs, Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives   $ 4,087
8.50% Senior Notes      
Revolving bank credit facility      
Derivatives 9,401 7,199
8.50% Senior Notes 963,000 612,000
Revolving bank credit facility $ 170,000 $ 117,000