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Net Income (Loss) Per Share - Additional Information (Detail) (Stock Options [Member])
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Stock Options [Member]
       
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Outstanding stock options and warrants 154,000 0 144,000 0