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Earnings Per Share - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]        
The number of dilutive shares excluded from calculation of basic earnings per share resulting from the anti-dilutive effect for stock options 0 0 0 0