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Pensions and Postretirement Benefits Other than Pensions - Estimated Benefit Payments for Domestic and Foreign Pension Plans and Other Postretirement Benefit Plans (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 89,433
2019 84,648
2020 86,980
2021 87,027
2022 88,491
2022 through 2026 446,996
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2018 14,838
2019 15,261
2020 15,919
2021 16,225
2022 16,462
2022 through 2026 $ 82,126