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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, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Tax provision (benefit) for recognized net actuarial loss (gain) | $ (39) |  |  | $ (23) |  |  | $ (109) | $ (84)
Unrecognized Pension Benefit Cost [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Tax provision (benefit) for recognized net actuarial loss (gain) | $ 39 | $ 35 | $ 35 | $ (23) | $ 31 | $ 31 |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Purchase of common shares | 7,070 | 13,800 | 52,590 | 24,335 | 29,724 | 75,246 |  |
Common Shares [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Issuance of common shares | 456 | 7,400 | 63,316 | 622 | 525 | 77,381 |  |
Common Shares Issued to Rabbi Trust [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Common shares distributed from rabbi trust | 19,043 | 400 | 3,727 | 622 | 525 | 3,358 |  |
Deferred Compensation Liability [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Common shares distributed from rabbi trust | 19,043 | 400 | 3,727 | 622 | 525 | 3,358 |  |
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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