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Pension Plans - Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Compensation And Retirement Disclosure [Abstract]        
Service cost $ 90 $ 48 $ 181 $ 95
Interest cost 326 354 653 708
Expected return on plan assets (556) (488) (1,113) (976)
Recognized net actuarial loss 130 125 259 250
Net periodic pension cost (benefit) $ (10) $ 39 $ (20) $ 77