Quarterly report pursuant to Section 13 or 15(d)

Document Entity Information

v2.4.0.6
Document Entity Information
3 Months Ended
Mar. 31, 2012
May 04, 2012
Common Class A [Member]
May 04, 2012
Common Class B [Member]
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 Mar. 31, 2012    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus Q1    
Amendment Flag false    
Common Stock   26,491,908 18,000,000