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Pension and other post-retirement benefits - Expected Benefit Payments (Detail) $ in Thousands | Dec. 31, 2018 USD ($)
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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

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- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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