Quarterly report pursuant to Section 13 or 15(d)

Summary of Company's Current Debt Portfolio (Detail)

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Summary of Company's Current Debt Portfolio (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Total debt $ 472,462 $ 482,723
Less current portion 43,000 145,723
Total long-term debt 429,462 337,000
9.125% Senior Notes, due April 2018 (Issued March 22, 2010)
   
Debt Instrument [Line Items]    
Total debt 300,000 300,000
9.125% Senior Notes, due April 2018 (Issued April 25, 2012)
   
Debt Instrument [Line Items]    
Total debt 129,462  
2.125% Convertible Senior Notes, due July 2012
   
Debt Instrument [Line Items]    
Total debt   121,723
Term Note
   
Debt Instrument [Line Items]    
Total debt $ 43,000 $ 61,000