XML 78 R65.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Summary of Significant Accounting Policies - Redeemable Non-Controlling Interest (Details) | Dec. 31, 2018 fund
--- | ---
Accounting Policies [Abstract] |
Investment funds formed to fund the purchase of solar energy systems | 4

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