Ameresco, Inc. Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities - Effects on Statements of Income (Loss) and Consolidated Statements of Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss (Gain) Recognized in Net Income	$ (3,047)	$ (780)	$ (3,308)	$ (225)
Derivatives Designated as Hedging Instruments: \| Other expenses, net \| Interest rate swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss (Gain) Recognized in Net Income	(546)	185	(757)	1,026
Derivatives Not Designated as Hedging Instruments: \| Other expenses, net \| Interest rate swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss (Gain) Recognized in Net Income	(1,281)	(844)	(1,160)	(2,865)
Derivatives Not Designated as Hedging Instruments: \| Other expenses, net \| Commodity swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss (Gain) Recognized in Net Income	0	514	0	3,028
Derivatives Not Designated as Hedging Instruments: \| Other expenses, net \| Make-whole provisions
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss (Gain) Recognized in Net Income	$ (1,764)	$ (450)	$ (2,146)	$ (388)