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Outstanding Loans and Security Agreements - Non-recourse Debt Facilities (Additional Information) (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2016
Jun. 30, 2015
Dec. 31, 2012
Debt Instrument [Line Items]          
Non-recourse debt, non-current $ 386,743,000 $ 270,053,000      
Unused borrowing capacity $ 759,000 $ 968,000      
Term loan | Term Loan due September 2028, Non-Recourse          
Debt Instrument [Line Items]          
Interest rate percentage 7.50% 7.50%      
Non-recourse debt, non-current $ 27,167,000 $ 28,920,000      
Term loan | Term Loan due December 2021, Non-Recourse          
Debt Instrument [Line Items]          
Interest rate percentage 2.50% 2.50%      
Non-recourse debt, non-current $ 0 $ 0      
LIBOR margin (as a percentage) 2.50% 2.50%      
Senior secured notes | Senior Secured Notes due March 2030, Non-Recourse          
Debt Instrument [Line Items]          
Interest rate percentage 6.07% 6.07%      
Non-recourse debt, non-current $ 70,926,000 $ 73,125,000      
PPA Company 3a | Term loan | Term Loan due September 2028, Non-Recourse          
Debt Instrument [Line Items]          
Interest rate percentage         7.50%
Debt face amount         $ 46,800,000
Debt minimum debt service reserves required 3,600,000 3,800,000      
PPA Company 4 | Senior secured notes | Senior Secured Notes due March 2030, Non-Recourse          
Debt Instrument [Line Items]          
Interest rate percentage     6.07%    
Debt minimum debt service reserves required $ 8,800,000 8,500,000      
PPA Company 5 | Term loan | Term Loan due December 2021, Non-Recourse          
Debt Instrument [Line Items]          
Debt face amount       $ 131,200,000  
Commitment fee percentage 0.50%        
PPA Company 5 | Term loan | Term Loan due December 2021, Years One Through Three, Non-Recourse | LIBOR          
Debt Instrument [Line Items]          
LIBOR margin (as a percentage) 2.25%        
PPA Company 5 | Term loan | Term Loan due December 2021, After Year Three, Non-Recourse | LIBOR          
Debt Instrument [Line Items]          
LIBOR margin (as a percentage) 2.50%        
PPA Company 5 | Letters of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 6,200,000     $ 6,400,000  
Amount outstanding 5,400,000 5,200,000      
Unused borrowing capacity $ 800,000 $ 1,000,000.0