Long-term Debt - Schedule of Outstanding Non-Recourse Asset-Backed Debt and Bank Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans	$ 3,251,630	$ 3,280,046
Assets	8,202,362	8,187,965
Collateral Pledged
Financial Instruments Owned and Pledged as Collateral [Line Items]
Restricted cash	26,000	35,000
Non-recourse debt
Financial Instruments Owned and Pledged as Collateral [Line Items]
Unamortized financing costs	(3,000)	(3,000)
Carrying Value	118,000	125,000
Non-recourse debt \| Collateral pledged
Financial Instruments Owned and Pledged as Collateral [Line Items]
Assets	303,000	311,000
Asset-backed non-recourse debt \| Collateral pledged \| Collateral Pledged
Financial Instruments Owned and Pledged as Collateral [Line Items]
Assets	303,000	311,000
Other non-recourse debt \| Non-recourse debt
Financial Instruments Owned and Pledged as Collateral [Line Items]
Other non-recourse debt	33,000	35,000
Anticipated Balance at Maturity	$ 0
Other non-recourse debt \| Non-recourse debt \| Minimum
Financial Instruments Owned and Pledged as Collateral [Line Items]
Stated Interest Rate	3.15%
Other non-recourse debt \| Non-recourse debt \| Maximum
Financial Instruments Owned and Pledged as Collateral [Line Items]
Stated Interest Rate	7.23%
Other non-recourse debt \| Non-recourse debt \| Collateral pledged
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans	$ 35,000	37,000
HASI Harmony Issuer \| Asset-backed non-recourse debt \| Non-recourse debt
Financial Instruments Owned and Pledged as Collateral [Line Items]
Outstanding principal balance	$ 88,000	93,000
Stated Interest Rate	6.78%
Anticipated Balance at Maturity	$ 0
HASI Harmony Issuer \| Asset-backed non-recourse debt \| Non-recourse debt \| Collateral pledged
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans	$ 268,000	$ 274,000

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-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-8

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(1)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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