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Shareholders Equity - Summary of Changes in Shareholders Equity (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Tax provision (benefit) for recognized net actuarial loss (gain) | $ (39) |  | $ (31) |  | $ (70) | $ (63)
Unrecognized Pension Benefit Cost [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Tax provision (benefit) for recognized net actuarial loss (gain) | $ 39 | $ 31 | $ 31 | $ 32 |  |
Treasury Stock [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Purchase of common shares | 60,608 | 75,246 | 29,724 | 40,891 |  |
Common Shares [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Issuance of common shares | 603 | 77,381 | 525 | 78,821 |  |
Paid In Capital [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Issuance of common shares | 603 | 77,381 | 525 | 78,821 |  |
Common Shares Issued to Rabbi Trust [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Common shares issued to rabbi trust | 603 | 3,358 | 525 | 705 |  |
Deferred Compensation Liability [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Common shares issued to rabbi trust | 603 | 3,358 | 525 | 705 |  |
Retained Earnings [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Cash dividends declared per share | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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