Annual report pursuant to Section 13 and 15(d)

Cover

v3.24.0.1
Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 23, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K/A    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 04-3512838    
Entity Emerging Growth Company false    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Entity File Number 001-34811    
Entity Registrant Name Ameresco, Inc.    
City Area Code 508    
Local Phone Number 661-2200    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 1,550,437,708
Entity Address, City or Town Framingham    
Entity Address, State or Province MA    
Entity Address, Address Line One 111 Speen Street    
Entity Address, Address Line Two Suite 410    
Entity Address, Postal Zip Code 01701    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Information [Line Items]      
Entity Central Index Key 0001488139    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 04-3512838    
Entity Address, City or Town Framingham    
Entity Address, State or Province MA    
Entity Address, Address Line One 111 Speen Street    
Entity Address, Address Line Two Suite 410    
Entity Address, Postal Zip Code 01701    
Title of 12(b) Security Class A Common Stock, par value $0.0001 per share    
Trading Symbol AMRC    
Security Exchange Name NYSE    
Auditor Firm ID 49    
Auditor Location Boston, Massachusetts    
Auditor Name RSM US LLP    
Common Class A      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   34,282,945  
Common Class B      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   18,000,000