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Employee Benefit Plans (Expected Future Benefit Payments Related to Defined Benefit Plans) (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Retirement Benefits [Abstract]  
2019 $ 9,753
2020 10,208
2021 10,519
2022 10,779
2023 11,077
2024 through 2028 56,225
Total defined benefit plan expected future benefit payments $ 108,561