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Option to Purchase Company's Common Stock (Detail) (Stock Option)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Stock Option
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities of earning per share amount 337,693 451,915 337,693 451,915