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Nature of Business - Changes in Accumulated Other Comprehensive (Loss) Income, Net of Tax by Components of Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 372,944	$ 380,426	$ 446,279
Other comprehensive (loss) income before reclassifications	(965)	4,375	(2,624)
Amounts reclassified to retained earnings			385
Amounts reclassified from accumulated other comprehensive (loss) income	690	403	238
Ending Balance	357,102	372,944	380,426
ASU 2018-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	385	385
Amounts reclassified to retained earnings			385
Ending Balance	385	385	385
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	32	(284)	(563)
Other comprehensive (loss) income before reclassifications	(705)	749	573
Amounts reclassified from accumulated other comprehensive (loss) income	121	(433)	(294)
Ending Balance	(552)	32	(284)
Defined Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(9,621)	(9,226)	(8,041)
Other comprehensive (loss) income before reclassifications	3,439	(1,231)	(1,717)
Amounts reclassified from accumulated other comprehensive (loss) income	569	836	532
Ending Balance	(5,613)	(9,621)	(9,226)
Foreign Currency Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,435)	(7,292)	(5,812)
Other comprehensive (loss) income before reclassifications	(3,699)	4,857	(1,480)
Ending Balance	(6,134)	(2,435)	(7,292)
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(11,639)	(16,417)	(14,416)
Ending Balance	$ (11,914)	$ (11,639)	$ (16,417)

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Cumulative effect on reclassification from AOCI to retained earnings due to changes in accounting standard.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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