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

Fair Value Measurement - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets:
Total assets	$ 2,220	$ 919
Liabilities:
Total liabilities	14,798	15,916
Level 2 \| Interest rate swap instruments
Assets:
Total assets	2,220	919
Liabilities:
Liability derivatives	2,726	6,316
Level 2 \| Commodity swap instruments
Liabilities:
Liability derivatives	4,568	1,962
Level 2 \| Make-whole provisions
Liabilities:
Liability derivatives	5,085	4,800
Level 3
Liabilities:
Contingent consideration	$ 2,419	$ 2,838