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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract]        
Service cost $ 366 $ 294 $ 1,109 $ 905
Interest cost 158 179 479 551
Expected return on plan assets (346) (381) (1,049) (1,174)
Amortization of actuarial losses 198 61 600 188
Net periodic pension cost $ 376 $ 153 $ 1,139 $ 470