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Summary of Significant Accounting Policies - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Accounting Policies [Abstract] | |||
| Restricted cash, noncurrent | $ 10,636us-gaap_RestrictedCashAndCashEquivalentsNoncurrent | $ 11,295us-gaap_RestrictedCashAndCashEquivalentsNoncurrent | |
| Maximum exposure, per participant | 75,000amrc_LossContingencySelfInsuranceMaximumExposurePerParticipant | ||
| Interest costs capitalized | 518us-gaap_InterestCostsCapitalized | 1,825us-gaap_InterestCostsCapitalized | 2,104us-gaap_InterestCostsCapitalized |
| Proceeds from government grants | 3,727amrc_ProceedsFromGovernmentGrants | 3,262amrc_ProceedsFromGovernmentGrants | 6,024amrc_ProceedsFromGovernmentGrants |
| Deferred grant income | 8,842us-gaap_OtherDeferredCreditsNoncurrent | 8,163us-gaap_OtherDeferredCreditsNoncurrent | |
| Rebates from utility company | 0amrc_RebatesFromUtilityCompany | 0amrc_RebatesFromUtilityCompany | 1,287amrc_RebatesFromUtilityCompany |
| Carrying value of fixed-rate long-term debt in excess of fair value | $ 70amrc_LongTermDebtCarryingValueInExcessOfFairValue | ||
| X | ||||||||||
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- Definition
Long-term Debt, Carrying Value in Excess of Fair Value No definition available.
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| X | ||||||||||
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- Definition
Loss Contingency, Self Insurance, Maximum Exposure, Per Participant No definition available.
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| X | ||||||||||
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- Definition
Proceeds from Government Grants No definition available.
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| X | ||||||||||
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- Definition
Rebates from Utility Company No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of interest capitalized during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date of unearned revenue or income not otherwise specified in the taxonomy which is expected to be taken into income after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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