XML 76 R63.htm IDEA: XBRL DOCUMENT v3.20.4

Summary of Significant Accounting Policies - Redeemable Non-Controlling Interest (Details)	Dec. 31, 2020 fund
Accounting Policies [Abstract]
Investment funds formed to fund the purchase of solar energy systems	5

X

- Definition

Investment Funds, Purchase Of Solar Energy Systems

+ References

No definition available.

+ Details

Name:	amrc_InvestmentFundsPurchaseOfSolarEnergySystems
Namespace Prefix:	amrc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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