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Benefit Plans - Anticipated Future Pension Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 10,726
2019 11,350
2020 12,063
2021 12,815
2022 13,523
2023 – 2027 78,179
Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 3,678
2019 3,834
2020 4,063
2021 4,253
2022 4,603
2023 – 2027 $ 25,204