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Sale of Bright Canyon Energy (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
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      
Term Loan | Non-Recourse Construction Term Loan Facility | BCE          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Debt instrument, face amount         $ 36,000
Bridge Loan | Equity Bridge Loan Facility | BCE          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Debt instrument, face amount       $ 31,000 $ 31,000
Discontinued Operations, Disposed of by Sale | Bright Canyou Energy Corportion          
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 32,000        
Discontinued Operations, Disposed of by Sale | Bright Canyou Energy Corportion | Forecast          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Investment tax credits     $ 28,000    
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 $ 34,000