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Reconciliations of Equity - Reconciliations of Total Equity (Parenthetical) (Detail) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Number of shares of common stock issued under stock option plan | 0 | 40,435 | 16,565 | 47,115
Number of common stock shares purchased | 53,058 |  | 135,103 | 160,780
Common stock | $ 0.305 | $ 0.275 | $ 0.915 | $ 0.825
Common Stock [Member] |  |  |  |
Number of shares of common stock issued under stock option plan | 0 | 40,435 | 16,565 | 47,115
Additional Paid-in Capital [Member] |  |  |  |
Number of shares of common stock issued under stock option plan | 0 | 40,435 | 16,565 | 47,115
Common Treasury Stock [Member] |  |  |  |
Number of common stock shares purchased | 53,058 |  | 135,103 | 160,780
Retained Earnings [Member] |  |  |  |
Common stock | $ 0.305 | $ 0.275 | $ 0.915 | $ 0.825

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