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Employee Benefit Plans - Expected Cash Flows for Pension Plans (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Retirement Benefits [Abstract]  
Employer contribution 2018 (expected) $ 47,038
Expected benefit payments:  
2018 116,326
2019 121,779
2020 127,219
2021 133,143
2022 138,211
2023 through 2027 $ 739,406