    <SEC-DOCUMENT>0001488139-23-000185-index.html : 20231212
    <SEC-HEADER>0001488139-23-000185.hdr.sgml : 20231212
    <ACCEPTANCE-DATETIME>20231212081806
    ACCESSION NUMBER:		0001488139-23-000185
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		24
    CONFORMED PERIOD OF REPORT:	20231211
    ITEM INFORMATION:		Entry into a Material Definitive Agreement
    ITEM INFORMATION:		Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20231212
    DATE AS OF CHANGE:		20231212

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Ameresco, Inc.
    		CENTRAL INDEX KEY:			0001488139
    		STANDARD INDUSTRIAL CLASSIFICATION:	CONSTRUCTION SPECIAL TRADE CONTRACTORS [1700]
    		IRS NUMBER:				043512838
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-34811
    		FILM NUMBER:		231480026

    	BUSINESS ADDRESS:
    		STREET 1:		111 SPEEN STREET
    		CITY:			FRAMINGHAM
    		STATE:			MA
    		ZIP:			01701
    		BUSINESS PHONE:		508-661-2200

    	MAIL ADDRESS:
    		STREET 1:		111 SPEEN STREET
    		CITY:			FRAMINGHAM
    		STATE:			MA
    		ZIP:			01701
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>amrc-20231211.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: amrc-20231211.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.1
    <SEQUENCE>2
    <FILENAME>exhibit101amendment4.htm
    <DESCRIPTION>EX-10.1
    <TEXT>
    Document 2 - file: exhibit101amendment4.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>3
    <FILENAME>amrc-20231211.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>exhibit101amendment4001.jpg
    <TEXT>
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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>exhibit101amendment4008.jpg
    <TEXT>
    Document 13 - file: exhibit101amendment4008.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>exhibit101amendment4009.jpg
    <TEXT>
    Document 14 - file: exhibit101amendment4009.jpg

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    <DOCUMENT>
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    <SEQUENCE>15
    <FILENAME>exhibit101amendment4010.jpg
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    <TYPE>XML
    <SEQUENCE>17
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    <TYPE>XML
    <SEQUENCE>18
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    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>19
    <FILENAME>Financial_Report.xlsx
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    <TEXT>
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    <TYPE>XML
    <SEQUENCE>20
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    <TEXT>
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    <TYPE>XML
    <SEQUENCE>21
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    <TEXT>
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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>22
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    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>24
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    <TYPE>ZIP
    <SEQUENCE>25
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