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Pension and other post-retirement benefits - Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Change in plan assets |  |
Non-current assets (note 11) | $ 48,477 | $ 26,482
Pension benefits |  |
Change in projected benefit obligation |  |
Projected benefit obligation, beginning of year | 628,135 | 765,618
Projected benefit obligation assumed from business combination | 0 | 87,933
Plan settlements | (3,226) | (112)
Service cost | 11,954 | 16,309
Interest cost | 33,687 | 24,787
Actuarial loss (gain) | 20,172 | (198,074)
Contributions from retirees | 0 | 0
Plan amendments | 0 | 0
Medicare Part D | 0 | 0
Benefits paid | (42,801) | (68,197)
Foreign exchange | (53) | (129)
Projected benefit obligation, end of year | 647,868 | 628,135
Change in plan assets |  |
Fair value of plan assets, beginning of year | 569,255 | 648,864
Plan assets acquired in business combination | 0 | 74,532
Actual return on plan assets | 65,272 | (109,118)
Employer contributions | 22,326 | 23,296
Plan settlements | (3,226) | (112)
Contributions from retirees | 0 | 0
Medicare Part D subsidy receipts | 0 | 0
Benefits paid | (42,801) | (68,197)
Foreign exchange | 2 | (10)
Fair value of plan assets, end of year | 610,828 | 569,255
Unfunded status | (37,040) | (58,880)
Non-current assets (note 11) | 12,598 | 12,264
Current liabilities | (1,416) | (1,907)
Non-current liabilities | (48,222) | (69,237)
Net amount recognized | (37,040) | (58,880)
OPEB |  |
Change in projected benefit obligation |  |
Projected benefit obligation, beginning of year | 217,330 | 292,646
Projected benefit obligation assumed from business combination | 0 | 5,195
Plan settlements | 0 | 0
Service cost | 3,253 | 6,277
Interest cost | 11,510 | 9,146
Actuarial loss (gain) | (10,913) | (82,991)
Contributions from retirees | 2,189 | 2,220
Plan amendments | 0 | (2,452)
Medicare Part D | 355 | 367
Benefits paid | (14,226) | (13,078)
Foreign exchange | 0 | 0
Projected benefit obligation, end of year | 209,498 | 217,330
Change in plan assets |  |
Fair value of plan assets, beginning of year | 172,167 | 192,375
Plan assets acquired in business combination | 0 | 8,577
Actual return on plan assets | 22,620 | (30,105)
Employer contributions | 10,677 | 11,811
Plan settlements | 0 | 0
Contributions from retirees | 2,189 | 2,220
Medicare Part D subsidy receipts | 355 | 367
Benefits paid | (14,226) | (13,078)
Foreign exchange | 0 | 0
Fair value of plan assets, end of year | 193,782 | 172,167
Unfunded status | (15,716) | (45,163)
Non-current assets (note 11) | 35,879 | 14,218
Current liabilities | (3,164) | (3,039)
Non-current liabilities | (48,431) | (56,342)
Net amount recognized | $ (15,716) | $ (45,163)

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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as current. Excludes other postretirement benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-2 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of receipt from prescription drug subsidy which increases plan assets of defined benefit postretirement plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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/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 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(1) -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)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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