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Income (Loss) Per Common Share - Additional Information (Detail) (Options Held)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Options Held
       
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Antidilutive Securities Excluded from Computation of Diluted Income(Loss) Per Common Share 336,500 1,158,000 1,777,360 1,328,350