Quarterly report pursuant to Section 13 or 15(d)

Long-term Debt - Schedule of Outstanding Non-Recourse Asset-Backed Debt (Details)

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Long-term Debt - Schedule of Outstanding Non-Recourse Asset-Backed Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying Value of Assets Pledged as of $ 3,165,000 $ 3,124,000
Total assets 6,727,950 6,552,350
Collateral Pledged    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Restricted cash 15,000 11,000
Asset-backed non-recourse debt | Collateral pledged | Collateral Pledged    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total assets 304,000 239,000
Non-recourse debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Unamortized financing costs (4,000) (2,000)
Total non-recourse debt 133,000 160,000
Non-recourse debt | Collateral pledged    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total assets 304,000 239,000
Non-recourse debt | Asset-backed non-recourse debt | HASI Sustainable Yield Bond 2015-1A    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of Convertible Notes $ 0 68,000
Interest rate (as a percent) 4.28%  
Anticipated Balance at Maturity $ 0  
Non-recourse debt | Asset-backed non-recourse debt | HASI Sustainable Yield Bond 2015-1A | Collateral pledged    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying Value of Assets Pledged as of 0 136,000
Non-recourse debt | Asset-backed non-recourse debt | HASI SYB Trust 2016-2    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of Convertible Notes $ 0 51,000
Interest rate (as a percent) 4.35%  
Anticipated Balance at Maturity $ 0  
Non-recourse debt | Asset-backed non-recourse debt | HASI SYB Trust 2016-2 | Collateral pledged    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying Value of Assets Pledged as of 0 57,000
Non-recourse debt | Asset-backed non-recourse debt | HASI Harmony Issuer    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of Convertible Notes $ 95,000 0
Interest rate (as a percent) 6.78%  
Anticipated Balance at Maturity $ 0  
Non-recourse debt | Asset-backed non-recourse debt | HASI Harmony Issuer | Collateral pledged    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying Value of Assets Pledged as of 261,000 0
Non-recourse debt | Other non-recourse debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Other non-recourse debt 42,000 43,000
Anticipated Balance at Maturity $ 17,000  
Non-recourse debt | Other non-recourse debt | Minimum    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Interest rate (as a percent) 3.15%  
Non-recourse debt | Other non-recourse debt | Maximum    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Interest rate (as a percent) 7.23%  
Non-recourse debt | Other non-recourse debt | Collateral pledged    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying Value of Assets Pledged as of $ 43,000 $ 46,000