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Pension Plans - Components of Net Periodic Pension Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Compensation And Retirement Disclosure [Abstract]
Service cost	$ 0	$ 90	$ 0	$ 181
Interest cost	282	326	564	653
Expected return on plan assets	(586)	(556)	(1,172)	(1,113)
Recognized net actuarial loss	149	130	298	259
Net periodic pension cost (benefit)	$ (155)	$ (10)	$ (310)	$ (20)

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