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Schedule of Expected Future Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
United States Pension Plans, Defined Benefit  
Defined Benefit Plan Disclosure  
2018 $ 19,387
2019 19,022
2020 19,688
2021 20,246
2022 20,994
2023-2027 110,214
Foreign Pension Plans, Defined Benefit  
Defined Benefit Plan Disclosure  
2018 886
2019 887
2020 1,253
2021 1,002
2022 952
2023-2027 6,294
Postretirement Benefit Plans  
Defined Benefit Plan Disclosure  
2018 591
2019 597
2020 535
2021 502
2022 439
2023-2027 $ 1,665