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Estimated Future Benefit Payments (Detail) $ in Thousands | Dec. 31, 2017 USD ($)
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Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
2018 | $ 5,510
2019 | 6,054
2020 | 6,314
2021 | 6,932
2022 | 6,986
2023 - 2027 | 44,677
Other Postretirement Benefit Plans, Defined Benefit |
Defined Benefit Plan Disclosure [Line Items] |
2018 | 2,252
2019 | 2,454
2020 | 2,635
2021 | 2,915
2022 | 3,130
2023 - 2027 | 19,349
Supplemental Employee Retirement Plans, Defined Benefit |
Defined Benefit Plan Disclosure [Line Items] |
2018 | 87
2019 | 589
2020 | 580
2021 | 723
2022 | 712
2023 - 2027 | $ 4,062

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