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Schedule of Expected Future Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
UNITED STATES  
Defined Benefit Plan Disclosure  
2019 $ 6,903
2020 7,133
2021 8,026
2022 8,863
2023 9,584
2024-2028 57,120
Foreign Pension Plans, Defined Benefit  
Defined Benefit Plan Disclosure  
2019 874
2020 1,522
2021 905
2022 888
2023 1,199
2024-2028 5,921
Postretirement Benefit Plans  
Defined Benefit Plan Disclosure  
2019 1,310
2020 1,234
2021 1,181
2022 984
2023 811
2024-2028 $ 2,364