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Net Earnings Per Share ("EPS") - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restricted Stock Units (RSUs) [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
RSUs excluded from the diluted EPS calculations 900 3,000 400 163,000