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Outstanding Loans and Security Agreements - Non-recourse Debt Facilities (Additional Information) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2012
Debt Instrument [Line Items]          
Unused borrowing capacity $ 968,000 $ 1,220,000      
Term loan | Term Loan due September 2028, Non-Recourse          
Debt Instrument [Line Items]          
Interest rate percentage 7.50% 7.50%      
Term loan | Term Loan due December 2021, Non-Recourse          
Debt Instrument [Line Items]          
Interest rate 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%      
PPA IIIa | Term loan | Term Loan due September 2028, Non-Recourse          
Debt Instrument [Line Items]          
Debt face amount         $ 46,800,000
Interest rate percentage         7.50%
Debt minimum debt service reserves required $ 3,800,000 $ 3,800,000      
PPA IV | 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 $ 8,500,000 8,000,000.0      
PPA V | 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 V | 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 V | 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 V | Letters of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 6,200,000     $ 6,400,000  
Amount outstanding 5,200,000 5,000,000.0      
Unused borrowing capacity $ 1,000,000.0 $ 1,200,000