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Property, plant and equipment - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant, and Equipment Disclosure [Line Items] |  |  |
U.S. Tax reform | $ 159,568 |  |
Contribution received |  | $ 238 | $ 1,299
Generation |  |  |
Property, Plant, and Equipment Disclosure [Line Items] |  |  |
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE | 111,192 | 117,556 | 111,192
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE, accumulated depreciation | 46,666 | 52,506 | 46,666
Depreciation expense |  | 537 | 1,489
Regulated Services Group |  |  |
Property, Plant, and Equipment Disclosure [Line Items] |  |  |
Cost of distribution assets | 3,076 | 3,270 | 3,076
Accumulated depreciation | 2,041 | 2,455 | 2,041
Utility plant |  |  |
Property, Plant, and Equipment Disclosure [Line Items] |  |  |
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE | 2,033,391 | 1,922,844 | 2,033,391
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE, accumulated depreciation | 133,644 | $ 141,466 | $ 133,644
Maximum |  |  |
Property, Plant, and Equipment Disclosure [Line Items] |  |  |
U.S. Tax reform | 259,942 |  |
Minimum |  |  |
Property, Plant, and Equipment Disclosure [Line Items] |  |  |
U.S. Tax reform | $ 100,374 |  |

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