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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, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Tax provision (benefit) for recognized net actuarial loss (gain) | $ (32) |  |  | $ (35) |  |  | $ (95) | $ (94)
Unrecognized Pension Benefit Cost [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Tax provision (benefit) for recognized net actuarial loss (gain) | $ 32 | $ 31 | $ 32 | $ 35 | $ 29 | $ 30 |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Purchase of common shares | 15,150 | 29,724 | 40,891 | 27,141 | 13,500 | 10,907 |  |
Common Shares [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Issuance of common shares | 1,262 | 525 | 78,821 | 272 | 1,730 | 21,458 |  |
Paid In Capital [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Issuance of common shares | 1,262 | 525 | 78,821 | 272 | 1,730 | 21,458 |  |
Common Shares Issued to Rabbi Trust [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Common shares issued to rabbi trust | 3,219 | 525 | 705 | 272 | 19,780 | 112 |  |
Deferred Compensation Liability [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Common shares issued to rabbi trust | 3,219 | 525 | 705 | 272 | 19,780 | 112 |  |
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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