Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v2.4.0.8
Document and Entity Information
6 Months Ended
Jun. 30, 2013
Aug. 02, 2013
Class A Common Stock
Aug. 02, 2013
Class B Common Stock
Entity Information [Line Items]      
Entity Registrant Name Ameresco, Inc.    
Entity Central Index Key 0001488139    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Document Type 10-Q    
Document Period End Date Jun. 30, 2013    
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus Q2    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   27,615,864 18,000,000