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Reconciliations of Equity - Reconciliations of Total Equity (Parenthetical) (Detail) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Number of shares of common stock issued under stock option plan | 2,747 | 38,706
Number of common stock shares purchased | 89,225 | 900
Common stock | $ 0.28 | $ 0.25
Common Stock [Member] |  |
Number of shares of common stock issued under stock option plan | 2,747 | 38,706
Additional Paid-in Capital [Member] |  |
Number of shares of common stock issued under stock option plan | 2,747 | 38,706
Treasury Stock [Member] |  |
Number of common stock shares purchased | 89,225 | 900
Retained Earnings [Member] |  |
Common stock | $ 0.28 | $ 0.25

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