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Income (Loss) Per Common Share - Additional Information (Detail) (Options Held)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 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 2,476,800 1,638,250 2,497,790 1,413,525