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Net Income Per Share of Common Stock - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Anti-dilutive shares excluded from computation of earnings per share 915,898 2,448,690 861,491 2,287,802