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Summary of Significant Accounting Policies - Sales Leaseback (Details)	12 Months Ended
	Dec. 31, 2020
Solar PV project
Sale Leaseback Transaction [Line Items]
Percentage of fair value threshold integral equipment	10.00%

X

- Definition

Percentage of Fair Value Threshold, Integral Equipment

+ References

No definition available.

+ Details

Name:	amrc_PercentageofFairValueThresholdIntegralEquipment
Namespace Prefix:	amrc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SaleLeasebackTransactionDescriptionAxis=amrc_SolarPhotovoltaicProjectsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: