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Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 1,443
2019 1,496
2020 1,538
2021 1,593
2022 1,635
Post-retirement [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 645
2019 684
2020 705
2021 771
2022 $ 828