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Option to Purchase Company's Common Stock (Detail) (Stock Option)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Stock Option
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities of earning per share amount 339,008 338,536 339,008 450,966