Pension and other postretirement benefits - Expected benefit payments (Detail) $ in Thousands	Dec. 31, 2023 USD ($)
Pension
Schedule Of Pension Expected Future Benefit Payments [Line Items]
2024	$ 23,044
2025	21,870
2026	21,751
2027	21,346
2028	21,066
Years 2029 — 2033	99,009
Other Benefits
Schedule Of Pension Expected Future Benefit Payments [Line Items]
2024	1,360
2025	1,346
2026	990
2027	728
2028	673
Years 2029 — 2033	$ 2,761

Schedule of Pension Expected Future Benefit Payments [Line Items]

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- Definition

Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

+ Details

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- Definition

Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

+ References

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Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

+ References

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

+ References

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