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Computation of Earnings Per Share - Additional Information (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Common stock excluded from the calculation of diluted earnings per share 48,840 113,251 65,053 113,251