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Retirement Plans - Expected Benefit Payments Required For Domestic Retirement Plan (Detail) - Domestic Plan [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 3,452
2019 3,214
2020 3,185
2021 3,056
2022 2,940
2023-2027 $ 12,893