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Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 1,615
2021 1,670
2022 1,695
2023 1,743
2024 1,805
Post-retirement  
Defined Benefit Plan Disclosure [Line Items]  
2020 749
2021 804
2022 817
2023 864
2024 $ 877