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Earnings Per Share - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Anti-dilutive common stock equivalents excluded from calculation of diluted earnings per share 1,243,549 337,682 1,406,844 1,745,469