Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Summary of Company's Current Debt Portfolio (Detail)

v2.4.0.8
Long-Term Debt - Summary of Company's Current Debt Portfolio (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Dec. 14, 2012
Debt Instrument [Line Items]      
Total debt $ 653,968 $ 479,205  
Less current portion 0 10,000  
Total long-term debt 653,968 469,205  
7.50% Senior Notes, due August 2020 [Member]
     
Debt Instrument [Line Items]      
Total debt 225,000 0  
9.125% Senior Notes, due April 2018 [Member]
     
Debt Instrument [Line Items]      
Total debt 428,968 429,205  
Term Note Due December 2017 [Member]
     
Debt Instrument [Line Items]      
Total debt $ 0 $ 50,000 $ 50,000