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Employee Benefit Plans - Schedule of Expected Benefit Payments (Detail) - Pension Plans [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 24,631
2019 25,347
2020 25,351
2021 26,981
2022 29,287
2023-2027 $ 153,490