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Pension Plans - Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]      
Service cost $ 299 $ 250 $ 255
Interest cost 1,411 1,349 1,456
Expected return on plan assets (1,946) (1,985) (1,903)
Recognized net actuarial loss 520 525 468
Net periodic pension cost $ 284 $ 139 $ 276