XML 75 R62.htm IDEA: XBRL DOCUMENT v3.20.4

Summary of Significant Accounting Policies - Equity Method Investments (Details)	Dec. 31, 2020 joint_venture
Accounting Policies [Abstract]
Number of joint ventures	4

X

- Definition

Number of Joint Ventures

+ References

No definition available.

+ Details

Name:	amrc_NumberOfJointVentures
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