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Revenue from Contracts with Customers - Consolidated Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Project development costs recognized	$ 12,737	$ 12,790	$ 35,172

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- Definition

Capitalized Contract Cost, Project Development Costs

+ References

No definition available.

+ Details

Name:	amrc_CapitalizedContractCostProjectDevelopmentCosts
Namespace Prefix:	amrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration