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Pensions - Estimated Benefit Payments for Domestic and Foreign Pension Plans (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Domestic Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 2,135
2019 2,220
2020 2,249
2021 2,279
2022 2,304
2023-2027 11,352
Foreign Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 644
2019 717
2020 766
2021 816
2022 847
2023-2027 4,875
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 27,520
2019 27,061
2020 26,783
2021 27,772
2022 30,003
2023-2027 153,144
Pension Plan [Member] | Domestic Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 21,183
2019 18,893
2020 18,875
2021 19,035
2022 19,236
2023-2027 95,413
Pension Plan [Member] | Foreign Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 6,337
2019 8,168
2020 7,908
2021 8,737
2022 10,767
2023-2027 $ 57,731