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Retirement Plans - Components of Net Periodic Pension Expense (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]      
Service cost     $ 0
Interest cost $ 484,000 $ 479,000 627,000
Expected return on plan assets (748,000) (811,000) (1,355,000)
Net amortization and deferral 289,000 156,000 149,000
Net periodic pension cost (benefit) 25,000 (176,000) (579,000)
Additional loss due to settlement 0 0 1,188,000
Total pension cost (benefit) 25,000 (176,000) 609,000
Net loss (gain) recognized in other comprehensive income 986,000 2,798,000 (1,453,000)
Total recognized in net periodic benefit cost and other comprehensive loss (before tax) $ 1,011,000 $ 2,622,000 $ (2,032,000)