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Estimated Future Benefit Payments (Detail) $ in Thousands | Dec. 31, 2018 USD ($)
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Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
2019 | $ 5,888
2020 | 6,484
2021 | 6,949
2022 | 6,853
2022 | 7,588
2024 - 2028 | 46,942
Other Postretirement Benefit Plans, Defined Benefit |
Defined Benefit Plan Disclosure [Line Items] |
2019 | 2,314
2020 | 2,520
2021 | 2,780
2022 | 2,955
2022 | 3,106
2024 - 2028 | 19,244
Supplemental Employee Retirement Plans, Defined Benefit |
Defined Benefit Plan Disclosure [Line Items] |
2019 | 522
2020 | 521
2021 | 681
2022 | 678
2022 | 675
2024 - 2028 | $ 4,904

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