Pension Information - 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	$ 0	$ 0
Interest cost	95	121
Expected return on plan assets	(160)	(187)
Other components	82	73
Net periodic pension cost	$ 17	$ 7