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Reconciliations of Equity - Reconciliations of Total Equity (Parenthetical) (Detail) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Number of shares of common stock issued under stock option plan | 13,256 | 5,032 | 56,385 | 85,394
Number of common stock shares purchased | 73,821 | 16,833 | 144,457 | 156,524
Common stock | $ 0.25 | $ 0.23 | $ 0.75 | $ 0.70
Common Stock [Member] |  |  |  |
Number of shares of common stock issued under stock option plan | 13,256 | 5,032 | 56,385 | 85,394
Additional Paid-in Capital [Member] |  |  |  |
Number of shares of common stock issued under stock option plan | 13,256 | 5,032 | 56,385 | 85,394
Treasury Stock [Member] |  |  |  |
Number of common stock shares purchased | 73,821 | 16,833 | 144,457 | 156,524
Retained Earnings [Member] |  |  |  |
Common stock | $ 0.25 | $ 0.23 | $ 0.75 | $ 0.70

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