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Schedule of Estimated Future Benefit Payments (Detail) $ in Thousands | Dec. 31, 2018 USD ($)
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Compensation And Retirement Disclosure [Abstract] |
2019 | $ 6,595
2020 | 6,744
2021 | 6,834
2022 | 6,891
2023 | 6,921
2024-2028 | 34,270
Total | $ 68,255

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