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Pension Plans - Expected Employee Benefit Payments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Defined Benefit Plan Estimated Future Benefit Payments [Abstract]    
2017 $ 670 $ 854
2018 841 841
2019 840 840
2020 818 818
2021 798 798
Thereafter 3,841 3,841
Total expected employee benefit payments $ 7,808 $ 7,992