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Retirement Plans and Other Postretirement Benefits - Summary of Benefit Payments Expected to be Paid (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Retirement Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 2,845
2021 2,920
2022 2,930
2023 2,996
2024 3,013
Years 2025-2029 15,122
Other Post Retirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 89
2021 92
2022 94
2023 97
2024 102
Years 2025-2029 $ 557