Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Narrative) (Detail)

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Long-Term Debt (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
May 07, 2012
Dec. 31, 2011
Jun. 30, 2012
Revolving Credit Facility
Jun. 30, 2012
8.5% Senior Notes
Dec. 31, 2011
8.5% Senior Notes
Debt Instrument [Line Items]            
Maturity date       May 05, 2015 Jun. 15, 2019  
Senior Notes interest rate         8.50%  
Annual effective interest rate       4.50% 8.60%  
Senior Notes outstanding         $ 600.0 $ 600.0
Revolving bank credit facility borrowing base before amendment   575.0        
Revolving bank credit facility borrowing base after amendment 650.0 650.0        
Revolving bank credit facility borrowings outstanding 80.0   117.0      
Letters of credit outstanding 0.6   0.4      
Line of credit, borrowing capacity availability $ 569.4