Commitments and Contingencies - Narrative (Details) - USD ($)					9 Months Ended	12 Months Ended
	Sep. 12, 2025	Jun. 20, 2025	Mar. 28, 2025	Sep. 13, 2024	Sep. 30, 2025	Dec. 31, 2024
Line of Credit Facility [Line Items]
Investment tax credit, purchase agreement			$ 9,801,000
Proceeds from investment tax credit			$ 8,037,000
Estimated loss per contract					$ 4,900,000
Estimated loss from claim					2,000,000
Apollo Management Holdings, L..P.
Line of Credit Facility [Line Items]
Investment tax credit, purchase agreement	$ 17,369,000	$ 16,740,000		$ 11,096,000
Proceeds from investment tax credit	14,567,000	13,686,000		$ 8,906,000
EagleBank
Line of Credit Facility [Line Items]
Investment tax credit, purchase agreement		16,740,000
Proceeds from investment tax credit		$ 13,686,000
Athene Annuity and Life Company
Line of Credit Facility [Line Items]
Investment tax credit, purchase agreement	17,369,000
Proceeds from investment tax credit	$ 14,567,000
V E C Partners Inc Dba C E I Builders C E I | M D Digester L L C
Line of Credit Facility [Line Items]
Estimated loss per contract					14,000,000
MD and VS Projects
Line of Credit Facility [Line Items]
Estimated loss from claim					3,141,000
Standby Letters of Credit
Line of Credit Facility [Line Items]
Standby letters of credit outstanding balance					15,485,000	$ 15,120,000
Draws on standby letters of credit					$ 0	$ 0