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Income Taxes - Deferred income tax assets and liabilities (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
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Dec. 31, 2013
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| Deferred Tax Assets, Net [Abstract] | ||
| Compensation accruals | $ 2,774us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits | $ 3,122us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits |
| Reserves | 3,638us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves | 3,110us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves |
| Other accruals | 2,893us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther | 2,344us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther |
| Net operating losses | 7,498us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 1,948us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
| Interest rate swaps | 1,715us-gaap_DeferredTaxAssetsDerivativeInstruments | 1,073us-gaap_DeferredTaxAssetsDerivativeInstruments |
| Energy efficiency | 19,116us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 9,524us-gaap_DeferredTaxAssetsTaxCreditCarryforwards |
| Deferred revenue | 1,769amrc_DeferredTaxAssetsDeferredRevenue | 1,624amrc_DeferredTaxAssetsDeferredRevenue |
| Gross deferred income tax assets | 39,403us-gaap_DeferredTaxAssetsGross | 22,745us-gaap_DeferredTaxAssetsGross |
| Valuation allowance | (3,995)us-gaap_DeferredTaxAssetsValuationAllowance | (1,953)us-gaap_DeferredTaxAssetsValuationAllowance |
| Total deferred income tax assets | 35,408us-gaap_DeferredTaxAssetsNet | 20,792us-gaap_DeferredTaxAssetsNet |
| Deferred tax liabilities: | ||
| Depreciation | (31,326)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (23,504)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
| Contract refinancing | (437)amrc_DeferredTaxLiabilitiesContractRefinancing | (710)amrc_DeferredTaxLiabilitiesContractRefinancing |
| Acquisition accounting | (159)amrc_DeferredTaxLiabilitiesAcquisitionAccounting | (242)amrc_DeferredTaxLiabilitiesAcquisitionAccounting |
| Total deferred income tax liabilities | (37,977)us-gaap_DeferredIncomeTaxLiabilities | (27,268)us-gaap_DeferredIncomeTaxLiabilities |
| Deferred income tax liabilities, net | (2,569)us-gaap_DeferredTaxAssetsLiabilitiesNet | (6,476)us-gaap_DeferredTaxAssetsLiabilitiesNet |
| CANADA | ||
| Deferred tax liabilities: | ||
| Foreign Authority |
(5,659)amrc_DeferredTaxLiabilitiesForeignAuthority / us-gaap_IncomeTaxAuthorityAxis = country_CA |
(2,047)amrc_DeferredTaxLiabilitiesForeignAuthority / us-gaap_IncomeTaxAuthorityAxis = country_CA |
| UNITED KINGDOM | ||
| Deferred tax liabilities: | ||
| Foreign Authority |
$ (396)amrc_DeferredTaxLiabilitiesForeignAuthority / us-gaap_IncomeTaxAuthorityAxis = country_GB |
$ (765)amrc_DeferredTaxLiabilitiesForeignAuthority / us-gaap_IncomeTaxAuthorityAxis = country_GB |
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- Definition
Deferred Tax Assets, Deferred Revenue No definition available.
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Deferred Tax Liabilities, Acquisition Accounting No definition available.
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Deferred Tax Liabilities, Contract Refinancing No definition available.
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- Definition
Deferred Tax Liabilities, Foreign Authority No definition available.
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from derivative instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from loss reserves other than estimated credit losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other reserves and accruals not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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