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Pension Plans and Other Postretirement Benefits - Defined Benefit Plan Estimated Future Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Pension Benefits [Member]  
Pension Plans, Postretirement and Other Employee Benefits [Line Items]  
2016 $ 77,923
2017 82,899
2018 87,480
2019 93,309
2020 98,138
2021 through 2025 561,736
Other Postretirement Benefits [Member]  
Pension Plans, Postretirement and Other Employee Benefits [Line Items]  
2016 8,771
2017 8,834
2018 8,952
2019 8,979
2020 8,973
2021 through 2025 $ 44,338