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Energy Assets - Financing Lease Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |
Financing lease assets | $ 42,402 | $ 42,402 |
Less - accumulated depreciation and amortization | (6,800) | (6,268) |
Financing lease assets, net | $ 35,602 | $ 36,134 | $ 38,263

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- Definition Finance Lease, Right-Of-Use Asset, Accumulated Depreciation + References No definition available. + Details
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Namespace Prefix: | amrc_
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- Definition Finance Lease, Right-Of-Use Asset, Gross + References No definition available. + Details
Name: | amrc_FinanceLeaseRightOfUseAssetGross
Namespace Prefix: | amrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Amount of lessee's right to use underlying asset under finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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