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Other long-term liabilities - Schedule of Long-Term Liabilities and Deferred Credits (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Other Long-term Liabilities |  |
Contract adjustment payments (note 7(a)) | $ 222,429 | $ 0
Asset retirement obligations | 137,300 | 79,968
Advances in aid of construction | 89,515 | 79,864
Environmental remediation obligation | 63,260 | 69,383
Customer deposits | 32,131 | 31,939
Unamortized investment tax credits | 17,671 | 17,893
Deferred credits | 21,685 | 21,399
Preferred shares, Series C | 13,868 | 13,698
Hook-up fees | 20,900 | 17,704
Lease liabilities | 22,866 | 14,288
Contingent development support obligations | 821 | 12,273
Hedge settlement obligation | 32,576 | 0
Note payable to related party | 0 | 30,493
Other | 27,134 | 23,027
Other long-term liabilities | 702,156 | 411,929
Less: current portion | (154,161) | (72,748)
Other long-term liabilities, excluding current | $ 547,995 | $ 339,181

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