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Expected Benefit Payments Related to Defined Benefit Pension Plans (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
U.S. Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 18,890
2019 1,770
2020 1,820
2021 1,920
2022 1,920
2023 - 2027 10,200
Non-U.S. Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 2,840
2019 2,122
2020 2,169
2021 2,273
2022 1,905
2023 - 2027 $ 10,737