Document and Entity Information
6 Months Ended
Jun. 30, 2015
Jul. 29, 2015
Document and Entity Information    
Entity Registrant Name Clean Energy Fuels Corp.  
Entity Central Index Key 0001368265  
Document Type 10-Q  
Document Period End Date Jun. 30, 2015  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   90,560,410
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2