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Long-term investments - Additional Information (Detail) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 07, 2021 USD ($) shares | Dec. 09, 2020 $ / instrument | Jun. 30, 2021 USD ($) businessUnit | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Aug. 12, 2021 USD ($) | Mar. 31, 2021 USD ($) windProject | Jan. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investments |  |  | $ 264,251 | $ 264,251 | $ 186,452 |  |  |
Noncontrolling interest in partnerships and joint ventures |  |  | $ 264,251 | 264,251 | 186,452 |  |  |
Fair value of support provided |  |  |  | $ 821 | $ 12,273 |  |  |
Maverick Creek and Sugar Creek Wind Facilities |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interest (percent) |  |  |  |  |  |  |  | 50.00%
Ownership interest acquired (percent) |  |  |  |  |  |  |  | 50.00%
Altavista |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership interest acquired (percent) |  |  | 50.00% | 50.00% |  |  |  |
Investments in joint venture |  |  | $ 6,735 | $ 6,735 |  |  |  |
Solar power capacity (megawatt ac) | businessUnit |  |  | 80 |  |  |  |  |
Atlantica |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interest (percent) |  |  | 44.20% | 44.20% | 44.20% |  |  |
Equity method investment, shares acquired (shares) | shares | 4,020,860 |  |  |  |  |  |  |
Equity method investments | $ 1,167,444 |  |  |  |  |  |  |
Atlantica | Maximum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interest (percent) |  |  | 48.50% | 48.50% |  |  |  |
Atlantica | Subscription Share Purchase Agreement |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Subscription purchase agreement, share price (in USD) | $ / instrument |  | 33.00 |  |  |  |  |  |
Payment for additional shares | $ 132,688 |  |  |  |  |  |  |
Texas Wind Farms |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interest (percent) |  |  | 51.00% | 51.00% |  |  | 51.00% |
Equity method investments |  |  |  |  |  |  | $ 234,274 |
Number of wind development projects acquired | windProject |  |  |  |  |  |  | 3 |
Number of wind development projects | windProject |  |  |  |  |  |  | 4 |
Fourth Texas Wind Facility | Subsequent Event |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interest (percent) |  |  |  |  |  | 51.00% |  |
Equity method investments |  |  |  |  |  | $ 110,609 |  |
Sugar Creek | Maverick Creek and Sugar Creek Wind Facilities |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership interest acquired (percent) |  |  |  |  |  |  | 50.00% |
Maverick | Maverick Creek and Sugar Creek Wind Facilities |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership interest acquired (percent) |  |  |  |  |  |  | 50.00% |
North Fork Ridge and Kings Point Facilities |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investments in joint venture |  |  | $ 31,297 | $ 31,297 |  |  |  |

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