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Employer Sponsored Benefit Plan (Estimated Future Benefit Payments) (Detail) - Domestic Pension Plan
$ in Thousands
Dec. 31, 2016
USD ($)
Defined Benefit Plan, Estimated Future Employer Contributions [Abstract]  
2017 $ 2,422
2018 2,500
2019 2,632
2020 2,773
2021 2,856
2022-2026 $ 14,742