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

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