Ameresco, Inc. Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments on the Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivatives Designated as Hedging Instruments \| Interest rate swap contracts \| Other assets
Derivatives, Fair Value [Line Items]
Fair value, asset derivatives	$ 1,023	$ 1,748
Derivatives Designated as Hedging Instruments \| Interest rate swap contracts \| Other liabilities
Derivatives, Fair Value [Line Items]
Fair value, liability derivatives	0	9
Derivatives Not Designated as Hedging Instruments \| Interest rate swap contracts \| Other assets
Derivatives, Fair Value [Line Items]
Fair value, asset derivatives	2,947	3,454
Derivatives Not Designated as Hedging Instruments \| Interest rate swap contracts \| Other liabilities
Derivatives, Fair Value [Line Items]
Fair value, liability derivatives	629	0
Derivatives Not Designated as Hedging Instruments \| Make-whole provisions \| Other liabilities
Derivatives, Fair Value [Line Items]
Fair value, liability derivatives	$ 6,012	$ 5,348