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Employee Benefit Plans (Expected Future Benefit Payments Related to Defined Benefit Plans) (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Retirement Benefits [Abstract]  
2018 $ 9,395
2019 9,837
2020 10,230
2021 10,524
2022 10,770
2023 through 2026 55,927
Total defined benefit plan expected future benefit payments $ 106,683