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Shareholders Equity - Summary of Changes in Shareholders Equity (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Tax provision (benefit) for recognized net actuarial loss (gain) | $ (23) |  |  | $ (32) |  |  | $ (84) | $ (95)
Unrecognized Pension Benefit Cost [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Tax provision (benefit) for recognized net actuarial loss (gain) | $ 23 | $ 39 | $ 31 | $ 32 | $ 31 | $ 32 |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Purchase of common shares | 24,335 | 60,608 | 75,246 | 15,150 | 29,724 | 40,891 |  |
Common Shares [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Issuance of common shares | 622 | 603 | 77,381 | 1,262 | 525 | 78,821 |  |
Paid In Capital [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Issuance of common shares | 622 | 603 | 77,381 | 1,262 | 525 | 78,821 |  |
Common Shares Issued to Rabbi Trust [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Common shares issued to rabbi trust | 622 | 603 | 3,358 | 3,219 | 525 | 705 |  |
Deferred Compensation Liability [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Common shares issued to rabbi trust | 622 | 603 | 3,358 | 3,219 | 525 | 705 |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared per share | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 |  |

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