v3.26.1
Redeemable Non-controlling Interests, Redeemable Preferred Non-controlling Interests and Stockholders' Deficit - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 06, 2026
Apr. 23, 2025
vote
vote_per_share
shares
Mar. 12, 2024
vote
vote_per_share
shares
Dec. 31, 2025
USD ($)
dividend_payment
$ / shares
shares
Preferred Units [Line Items]        
Number of votes per share | vote_per_share   5 5  
Preferred stock dividend rate       8.00%
Preferred stock, number of dividend payments to elect to issue additional Preferred Units | dividend_payment       8
Preferred stock dividend rate, event of default       12.00%
Preferred stock dividend rate, event of default, increase for each event       2.00%
Preferred stock dividend rate, event of default, maximum after increases       20.00%
Preferred stock liquidation preference (in dollars per share) | $ / shares       $ 100
Preferred stock redemption price (in dollars per share) | $ / shares       $ 100
Preferred stock redemption period after which redeemable       4 years
Preferred stock redemption period after fourth anniversary       30 days
Redemption price (in dollars per share) | $ / shares       $ 2.62
Fortistar        
Preferred Units [Line Items]        
Common stock, number of votes per share | vote   1 1  
Common Class A        
Preferred Units [Line Items]        
Common stock, shares authorized (in shares)       340,000,000
Class B common stock        
Preferred Units [Line Items]        
Common stock, shares authorized (in shares)       160,000,000
Class B common stock | Opal Fuels        
Preferred Units [Line Items]        
Stock issued (in shares)       144,399,037
Class C common stock        
Preferred Units [Line Items]        
Common stock, shares authorized (in shares)       160,000,000
Common Class D        
Preferred Units [Line Items]        
Common stock, shares authorized (in shares)       160,000,000
Common Class D | Fortistar        
Preferred Units [Line Items]        
Share conversion (in shares)   50,000,000 71,500,000  
Series A Preferred Stock        
Preferred Units [Line Items]        
Preferred stock, value, outstanding | $       $ 25,000
Series A Preferred Stock | Subsequent Event        
Preferred Units [Line Items]        
Preferred stock dividend rate 12.00%      
Preferred stock, dividend redemption, term 90 days      
Series A Preferred Stock | Preferred Stock Redeemed First 12 Months        
Preferred Units [Line Items]        
Preferred stock dividend rate       20.00%
Series A Preferred Stock | Preferred Stock Redeemed Thereafter        
Preferred Units [Line Items]        
Preferred stock dividend rate       30.00%
Series A Preferred Stock | Preferred Stock Redeemed Second 12 Months        
Preferred Units [Line Items]        
Preferred stock dividend rate       25.00%
Redeemable non-controlling interests        
Preferred Units [Line Items]        
Temporary equity, accretion to redemption value | $       $ 130,718