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Net Income Per Share of Common Stock - Additional Information (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Antidilutive shares excluded from computation of earnings per share 15,569 832,125 59,785 793,654