Annual report pursuant to Section 13 and 15(d)

Computations of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)

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Computations of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]      
Weighted average shares of participating unvested restricted stock 721 640 596