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Earnings Loss Per Common Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
May 09, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities excluded from the computation of diluted earnings (loss) per share 1.9 1.8  
Warrant
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities excluded from the computation of diluted earnings (loss) per share 4.0    
Convertible notes exchanged, warrants exercise price 1.863    
Senior Convertible Notes Due 2018
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities excluded from the computation of diluted earnings (loss) per share 9.3 19.9  
Convertible notes exchanged, warrants exercise price     1.863