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Pension and other post-retirement benefits - Expected Benefit Payments (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 31,101
2020 29,366
2021 32,508
2022 33,415
2023 35,111
2024-2028 183,338
Post Retirement Benefit Plan  
Defined Benefit Plan Disclosure [Line Items]  
2019 6,077
2020 6,686
2021 7,172
2022 7,731
2023 8,241
2024-2028 $ 47,119