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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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