Annual report pursuant to Section 13 and 15(d)

Income Taxes - Deferred income tax assets and liabilities (Details)

v2.4.1.9
Income Taxes - Deferred income tax assets and liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
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