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
9 Months Ended 9 Months Ended
Sep. 30, 2012
May 07, 2012
May 06, 2012
Dec. 31, 2011
Sep. 30, 2012
8.5% Senior Notes [Member]
Dec. 31, 2011
8.5% Senior Notes [Member]
Sep. 30, 2012
Revolving Credit Facility [Member]
Debt Instrument [Line Items]              
Maturity date         Jun. 15, 2019   May 05, 2015
Senior Notes interest rate         8.50% 8.50%  
Annual effective interest rate         8.60%   4.80%
Senior Notes outstanding         $ 600.0 $ 600.0  
Revolving bank credit facility borrowing base after amendment 650.0 650.0 575.0        
Revolving bank credit facility borrowings outstanding 119.0     117.0      
Letters of credit outstanding 0.6     0.4      
Line of credit, borrowing capacity availability $ 530.4