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Pension Plans - Expected Future Benefit Payments (Detail) - Pension Plan [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 4,358
2019 5,102
2020 4,764
2021 5,029
2022 5,990
2023 - 2027 $ 29,384