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Pension Benefit Plan - Summarization of Components of Net Periodic Pension Cost (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Service cost	$ 314	$ 310
Interest cost	87	108
Expected return on plan assets	(471)	(410)
Amortization of actuarial losses	278	237
Net periodic pension cost	$ 208	$ 245

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