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) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivatives     
Derivatives 8,733  
Fair Value, Inputs, Level 2
   
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivatives 317  
Derivatives 9,050 9,401
8.50% Senior Notes 977,625 963,000
Revolving bank credit facility $ 137,000 $ 170,000