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Reconciliations of Equity - Reconciliations of Total Equity (Parenthetical) (Detail) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Number of shares of common stock issued under stock option plan | 3,933 | 4,423 | 6,680 | 43,129
Number of common stock shares purchased | 71,555 | 69,736 | 160,780 | 70,636
Common stock | $ 0.28 | $ 0.25 | $ 0.56 | $ 0.50
Common Stock [Member] |  |  |  |
Number of shares of common stock issued under stock option plan | 3,933 | 4,423 | 6,680 | 43,129
Additional Paid-in Capital [Member] |  |  |  |
Number of shares of common stock issued under stock option plan | 3,933 | 4,423 | 6,680 | 43,129
Treasury Stock [Member] |  |  |  |
Number of common stock shares purchased | 71,555 | 69,736 | 160,780 | 70,636
Retained Earnings [Member] |  |  |  |
Common stock | $ 0.28 | $ 0.25 | $ 0.56 | $ 0.50

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