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Income Taxes - Reconciliation of effective tax rates (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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| Income Tax Disclosure [Abstract] | |||
| Income before provision for income taxes | $ 6,292us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 2,759us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 24,607us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
| Federal statutory tax expense | 2,202us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 966us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 8,612us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |
| State income taxes, net of Federal benefit | 666us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 201us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 818us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes |
| Net state impact of deferred rate change | 264amrc_IncomeTaxReconciliationNondeductibleExpenseDeferredRateChangeNet | (69)amrc_IncomeTaxReconciliationNondeductibleExpenseDeferredRateChangeNet | 0amrc_IncomeTaxReconciliationNondeductibleExpenseDeferredRateChangeNet |
| Non deductible expenses | (213)us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment | 2,008us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment | 2,612us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment |
| Stock-based compensation expense | 415us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 373us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 337us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost |
| Energy efficiency preferences | (9,517)amrc_IncomeTaxReconciliationNondeductibleExpenseEnergyEfficiencyPreferences | (3,280)amrc_IncomeTaxReconciliationNondeductibleExpenseEnergyEfficiencyPreferences | (7,033)amrc_IncomeTaxReconciliationNondeductibleExpenseEnergyEfficiencyPreferences |
| Foreign items and rate differential | 719us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 349us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 557us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |
| Valuation allowance | 1,408us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (276)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | |
| Miscellaneous | (35)amrc_IncomeTaxReconciliationNondeductibleExpenseMiscellaneous | 73amrc_IncomeTaxReconciliationNondeductibleExpenseMiscellaneous | 344amrc_IncomeTaxReconciliationNondeductibleExpenseMiscellaneous |
| Income tax (benefit) provision | $ (4,091)us-gaap_IncomeTaxExpenseBenefit | $ 345us-gaap_IncomeTaxExpenseBenefit | $ 6,247us-gaap_IncomeTaxExpenseBenefit |
| Effective tax rate: | |||
| Federal statutory rate expense | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |
| State income taxes, net of federal benefit | 10.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 7.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 3.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes |
| Net state impact of deferred rate change | 4.20%amrc_EffectiveIncomeTaxRateReconciliationStateImpactOfDeferredRateChangeNet | (2.50%)amrc_EffectiveIncomeTaxRateReconciliationStateImpactOfDeferredRateChangeNet | 0.00%amrc_EffectiveIncomeTaxRateReconciliationStateImpactOfDeferredRateChangeNet |
| Non deductible expenses | (3.40%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment | 72.80%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment | 10.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment |
| Stock-based compensation expense | 6.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost | 13.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost | 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost |
| Energy efficiency preferences | (151.30%)amrc_EffectiveIncomeTaxRateReconciliationEnergyEfficiencyPreferences | (118.90%)amrc_EffectiveIncomeTaxRateReconciliationEnergyEfficiencyPreferences | (28.60%)amrc_EffectiveIncomeTaxRateReconciliationEnergyEfficiencyPreferences |
| Foreign items and rate differential | 11.40%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | 12.60%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | 2.30%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential |
| Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent | 22.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (10.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance |
| Miscellaneous | (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 2.60%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments |
| Effective tax rate | (65.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations | 12.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 25.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations |
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- Definition
Effective Income Tax Rate Reconciliation, Energy Efficiency Preferences No definition available.
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- Definition
Effective Income Tax Rate Reconciliation, State Impact of Deferred Rate Change, Net No definition available.
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- Definition
Income Tax Reconciliation, Nondeductible Expense, Deferred Rate Change, Net No definition available.
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- Definition
Income Tax Reconciliation Nondeductible Expense Energy Efficiency Preferences No definition available.
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- Definition
Income Tax Reconciliation, Nondeductible Expense, Miscellaneous No definition available.
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- Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to meals and entertainment expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity-based compensation costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible meals and entertainment expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible equity-based compensation costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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