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Long-term investments - Operating entities (Detail) - $ / MWh | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2021
Texas Coastal Wind Facilities |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment acquired (percent) | 51.00% | 51.00%
Wind facility capacity (megawatt AC) | 861,000 |
Blue Hill Wind Facility |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment acquired (percent) | 20.00% |
Wind facility capacity (megawatt AC) | 175,000 |
Red Lily Wind Facility |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment acquired (percent) | 75.00% |
Wind facility capacity (megawatt AC) | 26,400 |
Val-Eo Wind Facility |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment acquired (percent) | 50.00% |
Wind facility capacity (megawatt AC) | 24,000 |

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