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Long-term investments - Narrative (Detail) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 05, 2023 USD ($) | May 31, 2020 shares | Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) wind_project | Jan. 04, 2024 | Nov. 30, 2021 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity-method investees |  |  | $ 381,802 | $ 456,393 | $ 381,802 |  |  |
Investments carried at fair value |  |  | 1,344,207 | 1,115,729 | 1,344,207 |  |  |
Number of wind development projects | wind_project |  |  |  |  |  | 4 |  |
Impairment |  |  | 0 |  | (75,910) |  |  |
Guarantor obligations |  |  | 113,630 | 113,630 | 113,630 |  |  |
Impairment of assets (notes 5 and 8(c)) |  |  |  | 23,492 | 235,478 |  |  |
Fair value of support provided |  |  |  | 12,666 | 8,824 |  |  |
Operating Segments | Renewable Energy Group |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity-method investees |  |  | 310,103 | 343,712 | 310,103 |  |  |
Investments carried at fair value |  |  | 1,342,223 | 1,113,767 | 1,342,223 |  |  |
Operating Segments | Regulated Services Group |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity-method investees |  |  | 56,199 | 112,180 | 56,199 |  |  |
Investments carried at fair value |  |  | 1,984 | 1,962 | 1,984 |  |  |
Corporate | Corporate |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity-method investees |  |  | 15,500 | 501 | 15,500 |  |  |
Investments carried at fair value |  |  | $ 0 | $ 0 | $ 0 |  |  |
Atlantica |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interest (percent) |  |  | 42.00% | 42.00% | 42.00% |  |  |
Equity interest, maximum (percent) |  |  |  | 48.50% |  |  |  |
Equity-method investees |  |  | $ 1,167,444 | $ 1,167,444 | $ 1,167,444 |  |  |
Investments carried at fair value |  |  | 1,268,140 | $ 1,052,703 | 1,268,140 |  |  |
Atlantica Yield Energy Solutions Canada Inc. |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Option to exchange shares | shares |  | 3,500,000 |  |  |  |  |  |
Common stock, conversion ratio |  |  |  | 1 |  |  |  |
Investments carried at fair value |  |  | 74,083 | $ 61,064 | 74,083 |  |  |
Texas Coastal Wind Facilities |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity-method investees |  |  |  |  |  | $ 344,883 |  |
Equity method investment acquired (percent) |  |  |  | 51.00% |  | 51.00% |  |
Texas Coastal Wind Facilities | Maximum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity-method investees |  |  | 282,726 |  | 282,726 |  |  |
Texas Coastal Wind Facilities | Minimum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity-method investees |  |  |  |  |  | $ 206,816 |  |
Investments in Significant Partnerships and Joint Ventures |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity-method investees |  |  | 381,802 | $ 456,393 | 381,802 | $ 433,850 |  |
Impairment |  |  |  |  | (75,910) |  |  |
Liberty Development JV Inc |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity-method investees |  |  |  |  |  |  |  | $ 19,688
Noninterest bearing loan | $ 35,000 |  |  |  |  |  |  |
Proceeds from equity | 17,500 |  |  |  |  |  |  |
Impairment of assets (notes 5 and 8(c)) | $ 18,911 |  |  |  |  |  |  |
Liberty Development JV Inc | Subsequent Event |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interest (percent) |  |  |  |  |  |  | 50.00% |
Wind And Solar Power Electric Development |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interest (percent) |  |  |  | 50.00% |  |  |  |
San Antonio Water System |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Aggregate cost |  |  | $ 25,634 | $ 25,634 | $ 25,634 |  |  |

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