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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net loss attributable to Clean Energy Fuels Corp. $ (23,819) $ (18,175) $ (179,026) $ (52,911)
Weighted-average common shares outstanding 219,290,040 223,428,900 221,103,270 223,310,150
Dilutive effect of potential common shares from restricted stock units, stock options and stock warrants 0 0 0 0
Weighted-average common shares outstanding - diluted 219,290,040 223,428,900 221,103,270 223,310,150
Basic loss per share (in dollars per share) $ (0.11) $ (0.08) $ (0.81) $ (0.24)
Diluted loss per share (in dollars per share) $ (0.11) $ (0.08) $ (0.81) $ (0.24)