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Shareholders Equity - Summary of Changes in Shareholders Equity (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Stockholders Equity Note [Line Items] |  |
Tax provision (benefit) for recognized net actuarial loss (gain) | $ (32) | $ (30)
Unrecognized Pension Benefit Cost [Member] |  |
Stockholders Equity Note [Line Items] |  |
Tax provision (benefit) for recognized net actuarial loss (gain) | $ 32 | $ 30
Treasury Stock [Member] |  |
Stockholders Equity Note [Line Items] |  |
Purchase of common shares | 40,891 | 10,907
Common Shares [Member] |  |
Stockholders Equity Note [Line Items] |  |
Issuance of common shares | 78,821 | 21,458
Paid In Capital [Member] |  |
Stockholders Equity Note [Line Items] |  |
Issuance of common shares | 78,821 | 21,458
Common Shares Issued to Rabbi Trust [Member] |  |
Stockholders Equity Note [Line Items] |  |
Common shares issued to rabbi trust | 705 | 112
Deferred Compensation Liability [Member] |  |
Stockholders Equity Note [Line Items] |  |
Common shares issued to rabbi trust | 705 | 112
Retained Earnings [Member] |  |
Stockholders Equity Note [Line Items] |  |
Cash dividends declared per share | $ 0.20 | $ 0.20

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