v3.26.1
Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Basic and diluted:          
Net loss attributable to Greenbacker Renewable Energy Company LLC $ (27,326) $ (15,586) $ (194,645) $ (242,300) $ (79,471)
Weighted average common shares outstanding used in computing net loss per share—basic (in shares) 199,387 199,333 199,383 199,313 199,293
Weighted average common shares outstanding used in computing net loss per share—diluted (in shares) 199,387 199,333 199,383 199,313 199,293
Net income (loss) per share—basic (in dollars per share) $ (0.14) $ (0.08) $ (0.98) $ (1.22) $ (0.40)
Net income (loss) per share—diluted (in dollars per share) $ (0.14) $ (0.08) $ (0.98) $ (1.22) $ (0.40)