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Reconciliation of Weighted Average Shares Used in Computation of Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share Disclosure [Line Items]    
Net loss available to common stockholders $ (27,562) $ (16,000)
Income available to common stockholders plus assumed exercises and conversion (27,562) (16,000)
Loss per share - basic    
Net loss available to common stockholders 21,873 25,831
Effect of dilutive securities:    
Convertible senior notes      
Options and warrants      
Unvested restricted stock grants      
Loss per share - diluted    
Loss available to common stockholders plus assumed exercises and conversion 21,873 25,831
Loss per share - basic    
Net loss available to common stockholders $ (1.26) $ (0.62)
Loss per share - diluted    
Loss available to common stockholders plus assumed exercises and conversion $ (1.26) $ (0.62)
4.50% Convertible senior notes
    
Earnings Per Share Disclosure [Line Items]    
Effect of dilutive securities      
Options and warrants
    
Earnings Per Share Disclosure [Line Items]    
Effect of dilutive securities      
Unvested restricted stock grants
    
Earnings Per Share Disclosure [Line Items]    
Effect of dilutive securities