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Earnings (Loss) Per Common Share - Additional Information (Detail) (Convertible Debt Securities)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Convertible Debt Securities
   
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share 1,150,404 1,172,602