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Other long-term liabilities - Schedule of Long-Term Liabilities and Deferred Credits (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Other Liabilities Disclosure [Abstract] |  |  |
Advances in aid of construction | $ 102,897 | $ 88,135 |
Asset retirement obligations | 42,694 | 41,754 | $ 47,047
Environmental remediation obligation | 41,714 | 40,772 | $ 42,457
Deferred credits and contingent consideration | 34,915 | 17,542 |
Customer deposits | 34,784 | 36,294 |
Unamortized investment tax credits | 17,180 | 17,255 |
Contingent liability (note 21(a)) | 15,656 | 84,641 |
Lease liabilities | 10,691 | 7,742 |
Hook-up fees | 1,499 | 7,425 |
Contract adjustment payments | 0 | 39,590 |
Other | 8,033 | 8,384 |
Other long-term liabilities | 310,063 | 389,534 |
Less: current portion | (36,265) | (79,315) |
Other long-term liabilities, excluding current | $ 273,798 | $ 310,219 |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481931/410-30-50-10 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481931/410-30-50-10 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 16 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481899/410-30-55-16 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480102/450-20-S99-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481931/410-30-50-7 + Details
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