Pension and other postretirement benefits - Expected benefit payments (Detail) $ in Thousands	Dec. 31, 2021 USD ($)
Pension
Schedule Of Pension Expected Future Benefit Payments [Line Items]
2022	$ 22,732
2023	22,859
2024	23,583
2025	23,976
2026	24,622
Years 2027 — 2031	127,007
Other Benefits
Schedule Of Pension Expected Future Benefit Payments [Line Items]
2022	2,723
2023	2,630
2024	2,432
2025	2,348
2026	2,073
Years 2027 — 2031	$ 7,388

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 http://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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