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Retirement Plans - Summary of Expected Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Estimated Future Benefit Payments [Abstract]  
2018 $ 1,903
2019 1,127
2020 650
2021 913
2022 1,182
2023 through 2027 4,723
Total $ 10,498