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Computations of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Earnings Per Share [Abstract] |  |  |  |
Weighted average shares of participating restricted stock | 763 | 676 | 685 | 663

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