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LONG-TERM DEBT - Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term debt $ 883,324 $ 1,324,383
Bank credit facility
   
Debt Instrument [Line Items]    
Long-term debt     
8 3/8% Senior Notes due 2017
   
Debt Instrument [Line Items]    
Long-term debt 295,504  
7 3/4% Senior Notes due 2019
   
Debt Instrument [Line Items]    
Long-term debt 300,000  
9 1/2% Senior Notes due 2020
   
Debt Instrument [Line Items]    
Long-term debt $ 287,820