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Reconciliations of Equity - Reconciliations of Total Equity (Parenthetical) (Detail) - $ / shares | 3 Months Ended
--- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018
Number of shares of common stock issued under stock option plan | 4,423 | 38,706 | 2,888 | 77,474
Number of common stock shares purchased | 69,736 | 900 | 133,584 | 6,107
Common stock | $ 0.25 | $ 0.25 | $ 0.23 | $ 0.23
Common Stock [Member] |  |  |  |
Number of shares of common stock issued under stock option plan | 4,423 | 38,706 | 2,888 | 77,474
Additional Paid-in Capital [Member] |  |  |  |
Number of shares of common stock issued under stock option plan | 4,423 | 38,706 | 2,888 | 77,474
Treasury Stock [Member] |  |  |  |
Number of common stock shares purchased | 69,736 | 900 | 133,584 | 6,107
Retained Earnings [Member] |  |  |  |
Common stock | $ 0.25 | $ 0.25 | $ 0.23 | $ 0.23

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