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Schedule of Expected Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 43,090
2019 40,894
2020 43,143
2021 44,568
2022 46,359
Years 2023 - 2027 261,475
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2018 2,560
2019 1,610
2020 1,557
2021 1,470
2022 1,393
Years 2023 - 2027 $ 4,888