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Retirement Plans and Other Post-Retirement Benefits - Summary of Benefit Expected to be Paid Out (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 2,290
2021 2,190
2022 2,134
2023 2,076
2024 2,016
2025 through 2029 24,071
Other Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 1,453
2021 973
2022 698
2023 538
2024 471
2025 through 2029 $ 1,724