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Employee Benefit Plans - Expected Cash Flows for Pension Plans (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Retirement Benefits [Abstract]  
Employer contribution 2020 (expected) $ 6,943
Expected benefit payments:  
2020 123,033
2021 130,333
2022 134,260
2023 138,539
2024 141,350
2025 through 2029 $ 737,591