Pension and other postretirement benefits - Expected benefit payments (Detail) $ in Thousands	Dec. 31, 2022 USD ($)
Pension
Schedule Of Pension Expected Future Benefit Payments [Line Items]
2023	$ 23,081
2024	23,445
2025	23,934
2026	24,564
2027	24,940
Years 2028 — 2032	127,978
Other Benefits
Schedule Of Pension Expected Future Benefit Payments [Line Items]
2023	2,174
2024	2,014
2025	1,986
2026	1,783
2027	1,576
Years 2028 — 2032	$ 6,509

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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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.

+ References

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

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