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Pension Plans - Components of Net Periodic Pension Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract]        
Service cost $ 48 $ 84 $ 95 $ 166
Interest cost 354 333 708 666
Expected return on plan assets (488) (496) (976) (991)
Recognized net actuarial loss 125 121 250 242
Net periodic pension cost $ 39 $ 42 $ 77 $ 83