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Retirement Plans - Summary of Expected Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Defined Benefit Plan Estimated Future Benefit Payments [Abstract]  
2019 $ 2,332
2020 330
2021 781
2022 1,734
2023 757
2024 through 2028 4,928
Total $ 10,862