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Summary of Significant Accounting Policies - Project Development Costs (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Accounting Policies [Abstract] |  |
Product development cost included in other long-term assets | $ 639 | $ 2,355

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- Definition Capitalized Project Development Costs, Noncurrent + References No definition available. + Details
Name: | amrc_CapitalizedProjectDevelopmentCostsNoncurrent
Namespace Prefix: | amrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration