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Other long-term liabilities - Schedule of Long-Term Liabilities and Deferred Credits (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Transactions with Third Party [Line Items] |  |  |
Contract adjustment payments | $ 39,590 | $ 113,876 |
Asset retirement obligations | 115,611 | 116,584 | $ 142,147
Advances in aid of construction | 88,135 | 88,546 |
Environmental remediation obligation | 40,772 | 42,457 | $ 55,224
Customer deposits | 36,294 | 34,675 |
Unamortized investment tax credits | 17,255 | 17,649 |
Deferred credits and contingent consideration | 40,945 | 39,498 |
Preferred shares, Series C | 0 | 12,072 |
Hook-up fees | 7,425 | 32,463 |
Lease liabilities | 20,493 | 21,834 |
Contingent development support obligations | 12,666 | 8,824 |
Contingent liability (note 22(a)) | 66,000 | 0 |
Other | 35,338 | 41,156 |
Other long-term liabilities | 546,332 | 595,442 |
Less: current portion | (80,458) | (134,212) |
Other long-term liabilities, excluding current | 465,874 | 461,230 |
Related Party |  |  |
Transactions with Third Party [Line Items] |  |  |
Note payable to related party | $ 25,808 | $ 25,808 |

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