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Earnings Per Share - Additional information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Share-based Payment Arrangement [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from the computation of earnings per share 44,490 70,245