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Summary of Significant Accounting Policies - Use of Estimates (Details) | 12 Months Ended
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Dec. 31, 2018 $ / participant
Accounting Policies [Abstract] |
Maximum exposure, per participant | 100,000

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- Definition Loss Contingency, Self Insurance, Maximum Exposure, Per Participant + References No definition available. + Details
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Namespace Prefix: | amrc_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

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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