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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, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Tax provision (benefit) for recognized net actuarial loss (gain) | $ (31) |  | $ (29) |  | $ (63) | $ (59)
Unrecognized Pension Benefit Cost [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Tax provision (benefit) for recognized net actuarial loss (gain) | $ 31 | $ 32 | $ 29 | $ 30 |  |
Treasury Stock [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Purchase of common shares | 29,724 | 40,891 | 13,500 | 10,907 |  |
Common Shares [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Issuance of common shares | 525 | 78,821 | 1,730 | 21,458 |  |
Paid In Capital [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Issuance of common shares | 525 | 78,821 | 1,730 | 21,458 |  |
Common Shares Issued to Rabbi Trust [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Common shares issued to rabbi trust | 525 | 705 | 19,780 | 112 |  |
Deferred Compensation Liability [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Common shares issued to rabbi trust | 525 | 705 | 19,780 | 112 |  |
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=27012166&loc=d3e187085-122770 + Details
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