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Pension and other postretirement benefits - Net benefit cost of pension and postretirement benefit plans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlements | $ 45,244 | $ 0 | $ 0
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 1,435 | 1,346 | 1,467
Interest cost | 17,297 | 10,776 | 9,272
Expected return on plan assets | (25,277) | (25,776) | (30,726)
Net amortization and deferral | 8,536 | 7,900 | 8,589
Settlements | 45,244 | 0 | 0
Net benefit expense (income) | 47,235 | (5,754) | (11,398)
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 0 | 0 | 0
Interest cost | 824 | 477 | 418
Expected return on plan assets | 0 | 0 | 0
Net amortization and deferral | (1,564) | (1,258) | (1,058)
Settlements | 0 | 0 | 0
Net benefit expense (income) | $ (740) | $ (781) | $ (640)

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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