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Sale of Bright Canyon Energy (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 31, 2024 | Aug. 04, 2023 | Feb. 11, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on sale relating to BCE | $ 6,423 | $ 0 | $ 0 |  |  |
Bridge Loan | Equity Bridge Loan Facility | Bright Canyon Energy Corporation |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 31,000 | $ 31,000
Term Loan | Non-Recourse Construction Term Loan Facility | Bright Canyon Energy Corporation |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 36,000
Discontinued Operations, Disposed of by Sale | Bright Canyon Energy Corporation |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Consideration received |  |  |  |  | $ 44,000 |
Gain on sale relating to BCE | 6,000 |  |  |  |  |
Assets held-for-sale | 35,000 |  |  |  |  |
Discontinued Operations, Disposed of by Sale | Bright Canyou Energy Corportion | Ameresco, Inc. |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Note receivable, net book value | $ 28,000 |  |  |  |  |
Discontinued Operations, Disposed of by Sale | Bright Canyou Energy Corportion | Subsequent Event |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Investment tax credits |  |  |  | $ 28,000 |  |

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