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Pension Plans - Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]      
Service cost $ 0 $ 299 $ 250
Interest cost 1,301 1,411 1,349
Expected return on plan assets (2,251) (1,946) (1,985)
Recognized net actuarial loss 475 520 525
Net periodic pension cost $ (475) $ 284 $ 139