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

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income tax (benefit) provision	$ (10,054)	$ 3,657	$ (10,552)	$ 10,896
Effective tax rate, percentage	(93.20%)	11.60%	(52.10%)	12.00%
Unrecognized tax benefits	$ 450		$ 450		$ 450

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.