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Earnings Per Share (EPS) - Additional Information (Detail) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock And Performance Based Equity Awards [Member] | Stock options [Member]      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Weighted average outstanding options, awards not included in diluted earnings per share 1,449,630 1,704,708 349,930