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Earnings Per Common Share Basic and Diluted (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator-basic and diluted        
Net income (loss) $ 22,522 $ (50,621) $ 57,886 $ (3,455)
Denominator        
Weighted average number of common shares outstanding-basic 39,789,000 39,094,000 39,637,000 39,212,000
Effect of dilutive stock options 414,000   353,000  
Effect of dilutive restricted shares 616,000   618,000  
Weighted average number of common shares outstanding-diluted 40,819,000 39,094,000 40,608,000 39,212,000
Earnings (loss) per common share-basic $ 0.57 $ (1.29) $ 1.46 $ (0.09)
Earnings (loss) per common share-diluted $ 0.55 $ (1.29) $ 1.43 $ (0.09)
Stock Options and Restricted Shares
        
Denominator        
Anti-dilutive securities excluded from computation of earnings per share 2,741,000 4,586,000 3,185,000 4,677,000