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Defined Benefit Pension Plan and Postretirement Benefits - Estimated Future Benefit Payments for Expected Future Service (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]  
2016 $ 143
2017 69
2018 45
2019 253
2020 157
2021 - 2025 $ 964