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Earnings per Common Share - Additional Information (Detail)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Class of Stock [Line Items]        
Antidilutive securities excluded from computation of earnings per share 16,753 24,716 2,717 11,117
Convertible Debt Securities
       
Class of Stock [Line Items]        
Antidilutive securities excluded from computation of earnings per share 15,000 15,000    
Preferred Stock
       
Class of Stock [Line Items]        
Antidilutive securities excluded from computation of earnings per share   4,446   5,426