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Pension Benefit Plan - Summarization of Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Compensation And Retirement Disclosure [Abstract]        
Service cost $ 325 $ 366 $ 942 $ 1,109
Interest cost 113 158 329 479
Expected return on plan assets (429) (346) (1,246) (1,049)
Amortization of actuarial losses 248 198 720 600
Net periodic pension cost $ 257 $ 376 $ 745 $ 1,139