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Debt - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
8.125% Senior Notes Due In 2018
Year
Dec. 31, 2011
8.125% Senior Notes Due In 2018
Aug. 17, 2010
8.125% Senior Notes Due In 2018
Aug. 17, 2010
Abl Facility
Year
Jun. 30, 2012
Abl Facility
Mar. 31, 2012
8.375% Senior Notes Due In 2017
Year
Jun. 30, 2012
8.375% Senior Notes Due In 2017
Dec. 31, 2011
8.375% Senior Notes Due In 2017
Nov. 13, 2009
8.375% Senior Notes Due In 2017
Debt Instrument [Line Items]                      
Senior notes issued         $ 375.0           $ 215.0
Interest rate on notes     8.125% 8.125% 8.125%     8.375% 8.375% 8.375%  
Debt instrument maturity date     Sep. 01, 2018         Nov. 15, 2017      
Common stock shares, issued 95,161,968 95,101,230       13,340,000          
Common stock shares, issued value per share           $ 5.67          
Credit facility, available borrowing capacity           275.0          
Financing fees     8.6     5.4   5.1      
Amortization period of financing fees (years)     8     4   8      
Commitment fee, percentage             0.50%        
Commitment fee, amount             264.0        
Debt instrument maturity period     2018                
Debt instrument maturity period     2018         2017 2017    
Discount on notes issued                 $ 2.3 $ 2.5 $ 3.1