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Employee Benefit Plans (Pension Benefit Plan) - Schedule of Pension Benefit Payments Expected Future Service (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Compensation And Retirement Disclosure [Abstract]  
2019 $ 400
2020 555
2021 646
2022 704
2023 808
2024 – 2028 5,430
Total $ 8,543