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Schedule of Expected Benefit Payments (Detail) $ in Thousands | Dec. 31, 2017 USD ($)
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Pension Plans, Defined Benefit |
Schedule of Pension Expected Future Benefit Payments [Line Items] |
2018 | $ 15,350
2019 | 5,812
2020 | 5,877
2021 | 5,966
2022 | 5,978
2023 - 2027 | 30,440
Total 10-year estimated future benefit payments | 69,423
Other Pension Plans, Defined Benefit |
Schedule of Pension Expected Future Benefit Payments [Line Items] |
2018 | 282
2019 | 301
2020 | 311
2021 | 302
2022 | 287
2023 - 2027 | 1,212
Total 10-year estimated future benefit payments | $ 2,695

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