$AMRC
Ameresco, Inc. Stock $amrc

$amrc Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-K Financial Statement

#000148813913000009 Filed on March 18, 2013

Income Statement

Concept	2012 Q4	2012	2011 Q4
Revenue	$156.6M	$631.2M	$188.5K
YoY Change	82974.79%	-13.32%	5.1%
Cost Of Revenue	$123.6M	$503.0M	$153.4M
YoY Change	-19.43%	-15.2%	3.58%
Gross Profit	$32.96M	$128.1M	$35.10M
YoY Change	-6.09%	-5.11%	12.14%
Gross Profit Margin	21.05%	20.3%	18621.28%
Selling, General & Admin	$21.40M	$81.80M	$19.00M
YoY Change	12.63%	23.75%	46.15%
% of Gross Profit	64.92%	63.83%	54.13%
Research & Development	$4.300M	$16.60M	$3.400M
YoY Change	26.47%	-9.29%	-41.38%
% of Gross Profit	13.04%	12.95%	9.69%
Depreciation & Amortization	$5.920M	$19.34M	$4.460M
YoY Change	32.74%	38.06%	74.22%
% of Gross Profit	17.96%	15.09%	12.71%
Operating Expenses	$26.70K	$99.49M	$22.44K
YoY Change	18.98%	17.93%	19.57%
Operating Profit	$6.264K	$28.66M	$12.62K
YoY Change	-50.35%	-43.46%	0.9%
Interest Expense		$3.634M	-$3.300M
YoY Change		-13.61%	230.0%
% of Operating Profit		12.68%	-26157.26%
Other Income/Expense, Net	-$216.00	-$4.050M	-$1.748K
YoY Change	-87.64%	-37.75%	-1044.86%
Pretax Income	$6.048K	$29.40M	$10.87K
YoY Change	-44.35%	-32.03%	-14.34%
Income Tax	$954.00	$6.247M	$2.425K
% Of Pretax Income	15.77%	21.25%	22.31%
Net Earnings	$5.094M	$18.36M	$8.443K
YoY Change	60234.0%	-45.05%	-4.95%
Net Earnings / Revenue	3.25%	2.91%	4.48%
Basic Earnings Per Share	$0.11	$0.41	$0.19
Diluted Earnings Per Share	$0.11	$0.40	$0.19
COMMON SHARES
Basic Shares Outstanding	45.12M shares	44.65M shares	43.51M shares
Diluted Shares Outstanding	46.51M shares	46.00M shares	45.55M shares

Balance Sheet

Concept	2012 Q4	2012	2011 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$63.30M	$63.30M	$26.30M
YoY Change	140.68%	140.68%	-41.16%
Cash & Equivalents	$63.35M	$63.30M	$26.28M
Short-Term Investments
Other Short-Term Assets	$112.3M	$112.3M	$103.1M
YoY Change	8.92%	8.92%	45.83%
Inventory	$9.502M	$9.500M	$8.636M
Prepaid Expenses	$9.601M		$8.993M
Receivables	$107.3M	$107.3M	$135.4M
Other Receivables	$5.400M	$5.400M	$9.600M
Total Short-Term Assets	$297.8M	$297.8M	$283.1M
YoY Change	5.22%	5.19%	33.7%
LONG-TERM ASSETS
Property, Plant & Equipment	$9.387M	$216.7M	$7.086M
YoY Change	32.47%	17.2%	31.07%
Goodwill	$48.97M		$47.88M
YoY Change	2.27%		132.65%
Intangibles	$9.743M		$12.73M
YoY Change	-23.45%
Long-Term Investments
YoY Change
Other Assets	$4.655M	$10.40M	$3.778M
YoY Change	23.19%	52.94%	-17.84%
Total Long-Term Assets	$377.6M	$377.7M	$362.5M
YoY Change	4.16%	4.19%	-2.73%
TOTAL ASSETS
Total Short-Term Assets	$297.8M	$297.8M	$283.1M
Total Long-Term Assets	$377.6M	$377.7M	$362.5M
Total Assets	$675.5M	$675.5M	$645.6M
YoY Change	4.63%	4.63%	10.84%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$101.0M	$101.0M	$93.51M
YoY Change	8.02%	8.02%	-1.89%
Accrued Expenses	$13.16M	$13.20M	$8.918M
YoY Change	47.54%	48.31%	-28.76%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$7.300M
YoY Change	-100.0%	-100.0%
Long-Term Debt Due	$12.45M	$12.50M	$11.56M
YoY Change	7.69%	7.76%	144.89%
Total Short-Term Liabilities	$148.9M	$148.9M	$148.3M
YoY Change	0.42%	0.4%	3.98%
LONG-TERM LIABILITIES
Long-Term Debt	$109.1M	$109.1M	$196.4M
YoY Change	-44.46%	-44.45%	-2.97%
Other Long-Term Liabilities	$30.36M	$130.8M	$28.53M
YoY Change	6.42%	278.03%	1.37%
Total Long-Term Liabilities	$264.8M	$239.9M	$260.9M
YoY Change	1.48%	3.85%	13.17%
TOTAL LIABILITIES
Total Short-Term Liabilities	$148.9M	$148.9M	$148.3M
Total Long-Term Liabilities	$264.8M	$239.9M	$260.9M
Total Liabilities	$413.7M	$413.6M	$260.9M
YoY Change	58.54%	1.08%	5.73%
SHAREHOLDERS EQUITY
Retained Earnings	$177.2M		$158.8M
YoY Change	11.56%		26.65%
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$9.183M		$9.183M
YoY Change	0.0%		0.0%
Treasury Stock Shares	4.833M shares		4.833M shares
Shareholders Equity	$261.8M	$261.8M	$236.4M
YoY Change
Total Liabilities & Shareholders Equity	$675.5M	$675.5M	$645.6M
YoY Change	4.63%	4.63%	10.47%

Cashflow Statement

Concept	2012 Q4	2012	2011 Q4
OPERATING ACTIVITIES
Net Income	$5.094M	$18.36M	$8.443K
YoY Change	60234.0%	-45.05%	-4.95%
Depreciation, Depletion And Amortization	$5.920M	$19.34M	$4.460M
YoY Change	32.74%	38.06%	74.22%
Cash From Operating Activities	-$350.0K	$42.21M	-$97.01M
YoY Change	-99.64%	-138.81%	-456.0%
INVESTING ACTIVITIES
Capital Expenditures	-$16.85M	$5.061M	-$17.68M
YoY Change	-4.69%	46.7%	31.06%
Acquisitions		$4.012M
YoY Change		-93.94%
Other Investing Activities	$2.740M	$3.300M	$2.520M
YoY Change	8.73%	-106.15%	-1675.0%
Cash From Investing Activities	-$14.11M	-$48.95M	-$15.16M
YoY Change	-6.93%	-53.64%	11.06%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$0.00
YoY Change
Debt Paid & Issued, Net		$5.587M
YoY Change		10.1%
Cash From Financing Activities	51.05M	$43.49M	106.7M
YoY Change	-52.16%	-77.92%	9514.41%
NET CHANGE
Cash From Operating Activities	-350.0K	$42.21M	-97.01M
Cash From Investing Activities	-14.11M	-$48.95M	-15.16M
Cash From Financing Activities	51.05M	$43.49M	106.7M
Net Change In Cash	36.59M	$36.74M	-5.450M
YoY Change	-771.38%	-311.42%	-137.05%
FREE CASH FLOW
Cash From Operating Activities	-$350.0K	$42.21M	-$97.01M
Capital Expenditures	-$16.85M	$5.061M	-$17.68M
Free Cash Flow	$16.50M	$37.15M	-$79.33M
YoY Change	-120.8%	-133.1%	-294.72%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	101007455	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	93506089	USD
CY2011Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	109296773	USD
CY2012Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	84124627	USD
CY2011Q4	us-gaap	Accounts Receivable Net Noncurrent AccountsReceivableNetNoncurrent	110212186	USD
CY2012Q4	us-gaap	Accounts Receivable Net Noncurrent AccountsReceivableNetNoncurrent	91854808	USD
CY2012Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	13157024	USD
CY2011Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	8917723	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	13735145	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	11531160	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	657685	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	713194	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	4763971	USD
CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	86067852	USD
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	93141432	USD
CY2010Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	74069087	USD
CY2012	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	52251348	USD
CY2010	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	39626528	USD
CY2011	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	45212139	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3611032	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5591239	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4507131	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1135391	USD
CY2010Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1677278	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1174458	USD
CY2009Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1602079	USD
CY2010	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	566772	USD
CY2012	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	456305	USD
CY2011	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1061782	USD
CY2011	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1752472	USD
CY2010	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	0	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5282170	USD
CY2010	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	856000	shares
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	681688	shares
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	88688	shares
CY2012Q4	us-gaap	Assets Assets	675472003	USD
CY2011Q4	us-gaap	Assets Assets	645597467	USD
CY2010Q4	us-gaap	Assets Assets	582450973	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	283062460	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	297842841	USD
CY2011Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	362535007	USD
CY2012Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	377629162	USD
CY2011Q4	us-gaap	Bank Overdrafts BankOverdrafts	7297122	USD
CY2012Q4	us-gaap	Bank Overdrafts BankOverdrafts	0	USD
CY2012Q4	us-gaap	Billings In Excess Of Cost Current BillingsInExcessOfCostCurrent	22271655	USD
CY2011Q4	us-gaap	Billings In Excess Of Cost Current BillingsInExcessOfCostCurrent	26982858	USD
CY2012	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	0.41
CY2011	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	0.72
CY2012	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	0.40
CY2011	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	0.69
CY2011	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	30776678	USD
CY2012	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	18360133	USD
CY2012	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	631170565	USD
CY2011	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	783303331	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	63347645	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	26277366	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	44691021	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	47927540	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-18413655	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	37070279	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-3236519	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2009Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.0001
CY2010Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.0001
CY2009Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	60000000	shares
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	29445667	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	18415642	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	29306647	USD
CY2012	us-gaap	Construction And Development Costs ConstructionAndDevelopmentCosts	16625103	USD
CY2010	us-gaap	Construction And Development Costs ConstructionAndDevelopmentCosts	13676795	USD
CY2011	us-gaap	Construction And Development Costs ConstructionAndDevelopmentCosts	18281729	USD
CY2012Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	9038725	USD
CY2011Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	6027689	USD
CY2011Q4	us-gaap	Contract Receivable Retainage ContractReceivableRetainage	26089216	USD
CY2012Q4	us-gaap	Contract Receivable Retainage ContractReceivableRetainage	23197784	USD
CY2010	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	0	USD
CY2011	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	593154171	USD
CY2010	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	507524239	USD
CY2012	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	503023288	USD
CY2010	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	378084610	USD
CY2012	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	354855706	USD
CY2011	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	446962891	USD
CY2012Q1	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	117349	USD
CY2012Q2	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	132942	USD
CY2010Q1	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	87230	USD
CY2010Q2	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	115201	USD
CY2011Q4	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	153439	USD
CY2011Q3	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	187948	USD
CY2010Q3	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	157021	USD
CY2010Q4	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	148073	USD
CY2012Q3	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	129104	USD
CY2012Q4	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	123628	USD
CY2011Q1	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	118437	USD
CY2011Q2	us-gaap	Cost Of Services Energy Services CostOfServicesEnergyServices	133330	USD
CY2012Q1	us-gaap	Costs And Expenses CostsAndExpenses	143148	USD
CY2012Q2	us-gaap	Costs And Expenses CostsAndExpenses	155841	USD
CY2010Q2	us-gaap	Costs And Expenses CostsAndExpenses	129341	USD
CY2010Q1	us-gaap	Costs And Expenses CostsAndExpenses	103066	USD
CY2011Q4	us-gaap	Costs And Expenses CostsAndExpenses	175878	USD
CY2011Q3	us-gaap	Costs And Expenses CostsAndExpenses	211395	USD
CY2010Q4	us-gaap	Costs And Expenses CostsAndExpenses	166839	USD
CY2010Q3	us-gaap	Costs And Expenses CostsAndExpenses	172988	USD
CY2012Q3	us-gaap	Costs And Expenses CostsAndExpenses	153197	USD
CY2012Q4	us-gaap	Costs And Expenses CostsAndExpenses	150327	USD
CY2011Q2	us-gaap	Costs And Expenses CostsAndExpenses	152124	USD
CY2011Q1	us-gaap	Costs And Expenses CostsAndExpenses	138117	USD
CY2011Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs CostsInExcessOfBillingsOnUncompletedContractsOrPrograms	69251022	USD
CY2012Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs CostsInExcessOfBillingsOnUncompletedContractsOrPrograms	62096284	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	9135447	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	10357326	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-10073322	USD
CY2010	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	280064	USD
CY2012	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	177713	USD
CY2011	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	-277157	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	10045674	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-10623700	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	12226191	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1588801	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	732514	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-273221	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	18724198	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-741160	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-2586080	USD
CY2012Q4	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	5746177	USD
CY2011Q4	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	2994692	USD
CY2012	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1298228	USD
CY2010	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	1069208	USD
CY2011	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	840435	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3798921	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-40556	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	21390872	USD
CY2012Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	28883919	USD
CY2011Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	31545373	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	85387	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1826239	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-368604	USD
CY2011Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	2601154	USD
CY2012Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	3125847	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	12013852	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	10918578	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-19697511	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-23496432	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	8048941	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	9186408	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	5190718	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	6456671	USD
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	334033	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	267996	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	1225197	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	3434973	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	2151789	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	1710319	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	2603512	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	2296691	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	1302684	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	541408	USD
CY2011Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	2869637	USD
CY2012Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	2827444	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	24888229	USD
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.12
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.18
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	29953103	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	26839863	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	27787503	USD
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3604741	USD
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2859197	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2597135	USD
CY2012	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
CY2011	us-gaap	Depreciation Depreciation	2554867	USD
CY2010	us-gaap	Depreciation Depreciation	1784295	USD
CY2012	us-gaap	Depreciation Depreciation	2828540	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	19340090	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	11419186	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	14008738	USD
CY2012	us-gaap	Depreciation Nonproduction DepreciationNonproduction	2828540	USD
CY2010	us-gaap	Depreciation Nonproduction DepreciationNonproduction	1784295	USD
CY2011	us-gaap	Depreciation Nonproduction DepreciationNonproduction	2554867	USD
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.78
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.07
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.41
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.11
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.04
CY2010Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.06
CY2010Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.26
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.19
CY2010Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.33
CY2010Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.15
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.11
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.13
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.75
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.40
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.04
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.10
CY2010Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.02
CY2010Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.17
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.24
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2010Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2010Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.26
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.15
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.11
CY2011	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-1034636	USD
CY2010	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	1338237	USD
CY2012	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	327800	USD
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.244	Rate
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.307	Rate
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.254	Rate
CY2010	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	Rate
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	Rate
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	Rate
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.005	Rate
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.023	Rate
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.002	Rate
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Meals And Entertainment EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment	0.003	Rate
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Meals And Entertainment EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment	0.106	Rate
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Meals And Entertainment EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment	0.003	Rate
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.000	Rate
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.014	Rate
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.005	Rate
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.032	Rate
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.014	Rate
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.007	Rate
CY2011	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.035	Rate
CY2012	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.033	Rate
CY2010	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.031	Rate
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	259890	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2725533	USD
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2010221	USD
CY2011	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	2725533	USD
CY2010	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	2010221	USD
CY2012	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	259890	USD
CY2011	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	2725533	USD
CY2012	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	259890	USD
CY2010	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	2010221	USD
CY2012	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	30568884	USD
CY2011Q4	us-gaap	Goodwill Goodwill	47881346	USD
CY2010	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	160455751	USD
CY2011	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	99781156	USD
CY2012	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	28650513	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	5282170	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	9742878	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	12727528	USD
CY2012	us-gaap	Finite Lived Intangible Assets Translation Adjustments FiniteLivedIntangibleAssetsTranslationAdjustments	16280	USD
CY2010	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-1346041	USD
CY2011	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-1313587	USD
CY2012	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-98027	USD
CY2010	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	0	USD
CY2011	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	514828	USD
CY2012	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	800000	USD
CY2010	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	20311842	USD
CY2011	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	25332314	USD
CY2012Q4	us-gaap	Goodwill Goodwill	48968390	USD
CY2010Q4	us-gaap	Goodwill Goodwill	20580995	USD
CY2012	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	2021260	USD
CY2011	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	26823070	USD
CY2011	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2010	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2012	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	1016325	USD
CY2010	us-gaap	Gross Profit GrossProfit	110702420	USD
CY2011	us-gaap	Gross Profit GrossProfit	135046147	USD
CY2012	us-gaap	Gross Profit GrossProfit	128147277	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	29400084	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	43255574	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	35642365	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	924531	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	4056936	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-4793198	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	44180105	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	24606886	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	39699301	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	6846	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2317	USD
CY2010Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	9643	USD
CY2010Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1207	USD
CY2011Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	10868	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	13713	USD
CY2010Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	16162	USD
CY2010Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12688	USD
CY2012Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	6048	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	9396	USD
CY2011Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	11927	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7672	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12185635	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6246753	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10767172	USD
CY2012Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	582	USD
CY2012Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2027	USD
CY2010Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	429	USD
CY2010Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3089	USD
CY2011Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2690	USD
CY2011Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2425	USD
CY2010Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4862	USD
CY2010Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3805	USD
CY2011Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2115	USD
CY2012Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	954	USD
CY2012Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2684	USD
CY2011Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3537	USD
CY2012Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	5385242	USD
CY2011Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	9662771	USD
CY2012	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	557104	USD
CY2011	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	239692	USD
CY2010	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-70656	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	15463037	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	13894755	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	8612410	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Meals And Entertainment IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment	99128	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Meals And Entertainment IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment	2611576	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Meals And Entertainment IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment	115629	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	240557	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	12132	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	336564	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1553018	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1220197	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	817901	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-13480285	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	3925716	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	10678911	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	22861989	USD
CY2012	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-25624181	USD
CY2010	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	305665	USD
CY2010	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-280200	USD
CY2012	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	4578300	USD
CY2011	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-7311938	USD
CY2012	us-gaap	Increase Decrease In Billing In Excess Of Cost Of Earnings IncreaseDecreaseInBillingInExcessOfCostOfEarnings	-4943161	USD
CY2011	us-gaap	Increase Decrease In Billing In Excess Of Cost Of Earnings IncreaseDecreaseInBillingInExcessOfCostOfEarnings	-452802	USD
CY2010	us-gaap	Increase Decrease In Billing In Excess Of Cost Of Earnings IncreaseDecreaseInBillingInExcessOfCostOfEarnings	-1258620	USD
CY2012	us-gaap	Increase Decrease In Construction Payables IncreaseDecreaseInConstructionPayables	-3009937	USD
CY2010	us-gaap	Increase Decrease In Construction Payables IncreaseDecreaseInConstructionPayables	925531	USD
CY2011	us-gaap	Increase Decrease In Construction Payables IncreaseDecreaseInConstructionPayables	1816884	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	858895	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	2542183	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1808348	USD
CY2011	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-3537261	USD
CY2010	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	8476965	USD
CY2012	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	2975301	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	790597	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-569954	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-5975610	USD
CY2012	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	-7225107	USD
CY2011	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	22452016	USD
CY2010	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	19311505	USD
CY2011	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	542485	USD
CY2012	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	446600	USD
CY2010	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	321074	USD
CY2011	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	7786995	USD
CY2010	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	8319286	USD
CY2012	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-3055300	USD
CY2010	us-gaap	Increase Decrease In Restricted Cash For Operating Activities IncreaseDecreaseInRestrictedCashForOperatingActivities	-151022923	USD
CY2012	us-gaap	Increase Decrease In Restricted Cash For Operating Activities IncreaseDecreaseInRestrictedCashForOperatingActivities	-34229875	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash For Operating Activities IncreaseDecreaseInRestrictedCashForOperatingActivities	-138485363	USD
CY2012	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	0	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	0	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	184246	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	10606192	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	0	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	0	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	4994730	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2119314	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1346188	shares
CY2011Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	12727528	USD
CY2012Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	9742878	USD
CY2012	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2104206	USD
CY2011	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	442699	USD
CY2010	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	252113	USD
CY2012	us-gaap	Interest Expense InterestExpense	3634146	USD
CY2010	us-gaap	Interest Expense InterestExpense	4944769	USD
CY2011	us-gaap	Interest Expense InterestExpense	4206622	USD
CY2012	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-3495784	USD
CY2010	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-4380183	USD
CY2011	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-4130350	USD
CY2012	us-gaap	Interest Income Operating InterestIncomeOperating	138362	USD
CY2010	us-gaap	Interest Income Operating InterestIncomeOperating	431000	USD
CY2011	us-gaap	Interest Income Operating InterestIncomeOperating	76272	USD
CY2012Q4	us-gaap	Inventory Net InventoryNet	9502289	USD
CY2011Q4	us-gaap	Inventory Net InventoryNet	8635633	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	4819	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	1735	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	675472003	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	645597467	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	148888812	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	148267775	USD
CY2011Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	260908657	USD
CY2012Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	264764000	USD
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	207965571	USD
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	214374850	USD
CY2012Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	12452678	USD
CY2011Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	11563983	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	158961382	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	12452678	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	4310675	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	18187931	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	10377724	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	10084460	USD
CY2012Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	201922172	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	196401588	USD
	us-gaap	Loss Contingency Damages Sought Value LossContingencyDamagesSoughtValue	6800000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest	-27583	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	63614	USD
CY2010Q4	us-gaap	Minority Interest MinorityInterest	0	USD
CY2012	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">DESCRIPTION OF BUSINESS</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Ameresco, Inc. (including its subsidiaries, the “Company”) was organized as a Delaware corporation on April 25, 2000. The Company is a provider of energy efficiency solutions for facilities throughout North America. The Company provides solutions, both products and services, that enable customers to reduce their energy consumption, lower their operating and maintenance costs and realize environmental benefits. The Company’s comprehensive set of services includes upgrades to a facility’s energy infrastructure and the construction and operation of small-scale renewable energy plants. It also sells certain photovoltaic equipment worldwide. The Company operates in the United States, Canada and Europe.</font><font style="font-family:inherit;font-size:1pt;"> </font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company is compensated through a variety of methods, including: 1) direct payments based on fee-for-services contracts (utilizing lump-sum or cost-plus pricing methodologies); 2) the sale of energy from the Company’s generating assets; and 3) direct payment for photovoltaic equipment and systems.</font></div></div>
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	58076011	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	20504969	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1832859	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-45929534	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-105601353	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-48953040	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	30146323	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	20849809	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	87528378	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	18360133	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	33412933	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	27513666	USD
CY2012Q3	us-gaap	Operating Expenses OperatingExpenses	24093	USD
CY2010Q1	us-gaap	Net Income Loss NetIncomeLoss	778	USD
CY2010Q2	us-gaap	Net Income Loss NetIncomeLoss	6554	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	8443	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	11023	USD
CY2010Q4	us-gaap	Net Income Loss NetIncomeLoss	8883	USD
CY2010Q3	us-gaap	Net Income Loss NetIncomeLoss	11300	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	6712	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	5094	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	5557	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	8390	USD
CY2010	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-6292996	USD
CY2012	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-4050116	USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-6505719	USD
CY2012Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1108	USD
CY2012Q2	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1413	USD
CY2010Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1356	USD
CY2010Q2	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-2371	USD
CY2011Q4	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1748	USD
CY2011Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-2696	USD
CY2010Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-2751	USD
CY2010Q4	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	185	USD
CY2012Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1313	USD
CY2012Q4	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-216	USD
CY2011Q2	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1431	USD
CY2011Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-631	USD
CY2012Q4	us-gaap	Number Of Interest Rate Derivatives Held NumberOfInterestRateDerivativesHeld	8	Swap
CY2012	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	4	segment
CY2010	us-gaap	Operating Expenses OperatingExpenses	64710123	USD
CY2011	us-gaap	Operating Expenses OperatingExpenses	84360323	USD
CY2012	us-gaap	Operating Expenses OperatingExpenses	99490275	USD
CY2012Q1	us-gaap	Operating Expenses OperatingExpenses	25799	USD
CY2012Q2	us-gaap	Operating Expenses OperatingExpenses	22899	USD
CY2010Q2	us-gaap	Operating Expenses OperatingExpenses	14140	USD
CY2010Q1	us-gaap	Operating Expenses OperatingExpenses	15836	USD
CY2011Q4	us-gaap	Operating Expenses OperatingExpenses	22439	USD
CY2011Q3	us-gaap	Operating Expenses OperatingExpenses	23447	USD
CY2010Q3	us-gaap	Operating Expenses OperatingExpenses	15967	USD
CY2010Q4	us-gaap	Operating Expenses OperatingExpenses	18766	USD
CY2012Q4	us-gaap	Operating Expenses OperatingExpenses	26699	USD
CY2011Q1	us-gaap	Operating Expenses OperatingExpenses	19680	USD
CY2011Q2	us-gaap	Operating Expenses OperatingExpenses	18794	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	45992297	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	28657002	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	50685824	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	3425	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	8259	USD
CY2010Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	12014	USD
CY2010Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	2563	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	12616	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	16409	USD
CY2010Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	12503	USD
CY2010Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	18913	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	10709	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	6264	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	13358	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	8303	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	8228280	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	2763345	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	488516	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	1225072	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	1595992	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	1786387	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	368968	USD
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	4286991	USD
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	5030781	USD
CY2010	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	3720349	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	4654709	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	3778357	USD
CY2012	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	722072	USD
CY2011	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-970884	USD
CY2010	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	1653430	USD
CY2012	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-666563	USD
CY2011	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-3135402	USD
CY2010	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	278571	USD
CY2011	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-970884	USD
CY2010	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	1653430	USD
CY2012	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	722072	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1932001	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4106286	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	55509	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	278571	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-666563	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-3135402	USD
CY2011Q4	us-gaap	Other Deferred Credits Noncurrent OtherDeferredCreditsNoncurrent	6024099	USD
CY2012Q4	us-gaap	Other Deferred Credits Noncurrent OtherDeferredCreditsNoncurrent	7590730	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	30362869	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	28529867	USD
	us-gaap	Partners Capital Account Sale Of Units PartnersCapitalAccountSaleOfUnits	27000000	USD
CY2010	us-gaap	Payments For Previous Acquisition PaymentsForPreviousAcquisition	0	USD
CY2011	us-gaap	Payments For Previous Acquisition PaymentsForPreviousAcquisition	1956366	USD
CY2012	us-gaap	Payments For Previous Acquisition PaymentsForPreviousAcquisition	0	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	768970	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2012	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	3207790	USD
CY2010	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1373171	USD
CY2011	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	644288	USD
CY2010	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	6303006	USD
CY2011	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	66232848	USD
CY2012	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	4012459	USD
CY2011	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	48457910	USD
CY2012	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	47190597	USD
CY2010	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	37825750	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5060751	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2613267	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3449940	USD
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.0001
CY2011Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.0001
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2011Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2011Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2011Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2012Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2012Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	0	USD
CY2011Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	0	USD
CY2010Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	0	USD
CY2012Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	9600619	USD
CY2011Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	8992963	USD
CY2010	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	53232458	USD
	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	63400000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	747362	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	37713158	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	12981691	USD
CY2012	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	-9285713	USD
CY2011	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	42142858	USD
CY2010	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	-19915218	USD
CY2012	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	-91197	USD
CY2011	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	63614	USD
CY2010	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
CY2012	us-gaap	Proceeds From Repayments Of Bank Overdrafts ProceedsFromRepaymentsOfBankOverdrafts	-7297122	USD
CY2011	us-gaap	Proceeds From Repayments Of Bank Overdrafts ProceedsFromRepaymentsOfBankOverdrafts	7297122	USD
CY2010	us-gaap	Proceeds From Repayments Of Bank Overdrafts ProceedsFromRepaymentsOfBankOverdrafts	0	USD
CY2010	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	-6298988	USD
CY2011	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	-7823912	USD
CY2012	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	-17799578	USD
CY2012	us-gaap	Proceeds From Sale Of Machinery And Equipment ProceedsFromSaleOfMachineryAndEquipment	0	USD
CY2010	us-gaap	Proceeds From Sale Of Machinery And Equipment ProceedsFromSaleOfMachineryAndEquipment	0	USD
CY2011	us-gaap	Proceeds From Sale Of Machinery And Equipment ProceedsFromSaleOfMachineryAndEquipment	7800000	USD
CY2012	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	3462679	USD
CY2010	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2674764	USD
CY2011	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	6407804	USD
CY2010	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	2026	USD
CY2010	us-gaap	Profit Loss ProfitLoss	27513666	USD
CY2012	us-gaap	Profit Loss ProfitLoss	18360133	USD
CY2011	us-gaap	Profit Loss ProfitLoss	33412933	USD
CY2012Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	23122363	USD
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	18617324	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	7086164	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	9387218	USD
CY2012Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	207274982	USD
CY2011Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	177854734	USD
CY2010	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	126219	USD
CY2011	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	24374	USD
CY2012	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	148773	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	5587186	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	5074411	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	10970656	USD
CY2010	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	2998750	USD
CY2011	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	0	USD
CY2012	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	0	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	26358908	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	12372356	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	177169717	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	158809584	USD
CY2010Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	125396651	USD
CY2010	us-gaap	Salaries And Wages SalariesAndWages	30721486	USD
CY2011	us-gaap	Salaries And Wages SalariesAndWages	40746280	USD
CY2012	us-gaap	Salaries And Wages SalariesAndWages	51279963	USD
CY2010	us-gaap	Sales Revenue Energy Services SalesRevenueEnergyServices	455329696	USD
CY2011	us-gaap	Sales Revenue Energy Services SalesRevenueEnergyServices	551323840	USD
CY2012	us-gaap	Sales Revenue Energy Services SalesRevenueEnergyServices	448983992	USD
CY2010	us-gaap	Sales Revenue Net SalesRevenueNet	618226659	USD
CY2011	us-gaap	Sales Revenue Net SalesRevenueNet	728200318	USD
CY2012	us-gaap	Sales Revenue Net SalesRevenueNet	631170565	USD
CY2012Q1	us-gaap	Sales Revenue Net SalesRevenueNet	146573	USD
CY2012Q2	us-gaap	Sales Revenue Net SalesRevenueNet	164100	USD
CY2010Q1	us-gaap	Sales Revenue Net SalesRevenueNet	105629	USD
CY2010Q2	us-gaap	Sales Revenue Net SalesRevenueNet	141355	USD
CY2011Q4	us-gaap	Sales Revenue Net SalesRevenueNet	188494	USD
CY2011Q3	us-gaap	Sales Revenue Net SalesRevenueNet	227804	USD
CY2010Q3	us-gaap	Sales Revenue Net SalesRevenueNet	191901	USD
CY2010Q4	us-gaap	Sales Revenue Net SalesRevenueNet	179342	USD
CY2012Q3	us-gaap	Sales Revenue Net SalesRevenueNet	163906	USD
CY2012Q4	us-gaap	Sales Revenue Net SalesRevenueNet	156591	USD
CY2011Q1	us-gaap	Sales Revenue Net SalesRevenueNet	146420	USD
CY2011Q2	us-gaap	Sales Revenue Net SalesRevenueNet	165482	USD
CY2011	amrc	Allowance For Doubtful Accounts Receivable Charge Offs And Other AllowanceForDoubtfulAccountsReceivableChargeOffsAndOther	566261	USD
CY2012	amrc	Allowance For Doubtful Accounts Receivable Charge Offs And Other AllowanceForDoubtfulAccountsReceivableChargeOffsAndOther	109706	USD
CY2012Q4	amrc	Costs And Estimated Earnings In Excess Of Billings On Uncompleted Contracts Net Of Billings In Excess Of Costs And Estimated Earnings On Uncompleted Contracts Net CostsAndEstimatedEarningsInExcessOfBillingsOnUncompletedContractsNetOfBillingsInExcessOfCostsAndEstimatedEarningsOnUncompletedContractsNet	39824629	USD
CY2010	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	2.074
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	7.249
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	10.787
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	12.520
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	3351142	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	2865706	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	2498660	USD
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	3309722	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	3896512	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	4.986
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	3.773
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	12829917	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	31757430	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	19947860	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	230294	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	46968	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	316700	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	856000	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	257500	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	706644	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	8274000	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	4778143	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	9450200	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	5424612	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	4.177
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	2.680
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	6.794
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	5.151
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber	1432041	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice	10.951
CY2010	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	1.484
CY2011	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	2.305
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	2.651
CY2010	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	13.045
CY2012Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	3309722	shares
CY2012Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	4778143	shares
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P8Y3M26D
CY2012	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1306145	shares
CY2010	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1801906	shares
CY2011	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	2790188	shares
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	6407804	USD
CY2010	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2674764	USD
CY2012	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	3462679	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	236421035	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	261819191	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	195051731	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	102769787	USD
CY2010Q3	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio StockholdersEquityNoteStockSplitConversionRatio	2
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	4833284	shares
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	4833284	shares
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	9182571	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	9182571	USD
CY2010Q4	us-gaap	Treasury Stock Value TreasuryStockValue	9182571	USD
CY2012	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-98026	USD
CY2011	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-1313587	USD
CY2010	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-1346041	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4900000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1400000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8100000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	6800000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	100000	USD
CY2011	amrc	Proceeds From Government Grants ProceedsFromGovernmentGrants	6695711	USD
CY2012	amrc	Proceeds From Government Grants ProceedsFromGovernmentGrants	6023767	USD
CY2012	amrc	Proceeds From Government Grants And Rebates Received On Project Assets ProceedsFromGovernmentGrantsAndRebatesReceivedOnProjectAssets	7310767	USD
CY2011	amrc	Proceeds From Government Grants And Rebates Received On Project Assets ProceedsFromGovernmentGrantsAndRebatesReceivedOnProjectAssets	6695711	USD
CY2010	amrc	Proceeds From Government Grants And Rebates Received On Project Assets ProceedsFromGovernmentGrantsAndRebatesReceivedOnProjectAssets	812489	USD
CY2011Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41322276	shares
CY2011Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42367242	shares
CY2010	amrc	Allowance For Doubtful Accounts Receivable Charge Offs And Other AllowanceForDoubtfulAccountsReceivableChargeOffsAndOther	51020	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3500000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	300000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	3400000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	800000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</font><font style="font-family:inherit;font-size:1pt;"> </font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. The most significant estimates with regard to these consolidated financial statements relate to the estimation of final construction contract profit in accordance with accounting for long-term contracts, allowance for doubtful accounts, inventory reserves, project development costs, fair value of derivative financial instruments and stock-based awards, impairment of long lived assets, income taxes and estimating potential liability in conjunction with certain commitments and contingencies. Actual results could differ from those estimates.</font><font style="font-family:inherit;font-size:1pt;"> </font></div></div>
CY2012	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	11229380	USD
CY2011	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	9701399	USD
CY2010	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	9634891	USD
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45995463	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	44707132	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41513482	shares
CY2012Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46128417	shares
CY2012Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46359323	shares
CY2010Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	38412419	shares
CY2010Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	36587847	shares
CY2011Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45554558	shares
CY2011Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46308032	shares
CY2010Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46147728	shares
CY2010Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	43445391	shares
CY2012Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46508767	shares
CY2012Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46247239	shares
CY2011Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45823090	shares
CY2011Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45907748	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25728314	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42587818	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44649275	shares
CY2012Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44541025	shares
CY2012Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44145093	shares
CY2010Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	13282284	shares
CY2010Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	13742472	shares
CY2011Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43116861	shares
CY2011Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43514982	shares
CY2010Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	34434352	shares
CY2010Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41086998	shares
CY2012Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44788160	shares
CY2012Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	45116164	shares
	amrc	Proceeds From Issuance Initial Public Offering Net ProceedsFromIssuanceInitialPublicOfferingNet	56400000	USD
CY2010	amrc	Proceeds From Stock Options Exercised Including Initial Public Offering ProceedsFromStockOptionsExercisedIncludingInitialPublicOffering	-60073139	USD
CY2011	amrc	Proceeds From Stock Options Exercised Including Initial Public Offering ProceedsFromStockOptionsExercisedIncludingInitialPublicOffering	-6407804	USD
CY2012	amrc	Proceeds From Stock Options Exercised Including Initial Public Offering ProceedsFromStockOptionsExercisedIncludingInitialPublicOffering	-3462679	USD
CY2011Q4	amrc	Costs And Estimated Earnings In Excess Of Billings On Uncompleted Contracts Net Of Billings In Excess Of Costs And Estimated Earnings On Uncompleted Contracts Net CostsAndEstimatedEarningsInExcessOfBillingsOnUncompletedContractsNetOfBillingsInExcessOfCostsAndEstimatedEarningsOnUncompletedContractsNet	42268164	USD
	amrc	Costs Incurred In Initial Public Offering CostsIncurredInInitialPublicOffering	7000000	USD
CY2010	amrc	Deferred Income Tax Expense Benefit Excluding Effects Of Exchange Rates On Cash DeferredIncomeTaxExpenseBenefitExcludingEffectsOfExchangeRatesOnCash	-253975	USD
CY2011	amrc	Deferred Income Tax Expense Benefit Excluding Effects Of Exchange Rates On Cash DeferredIncomeTaxExpenseBenefitExcludingEffectsOfExchangeRatesOnCash	19842638	USD
CY2012	amrc	Deferred Income Tax Expense Benefit Excluding Effects Of Exchange Rates On Cash DeferredIncomeTaxExpenseBenefitExcludingEffectsOfExchangeRatesOnCash	-3849798	USD
CY2011Q4	amrc	Deferred Tax Assets Deferred Revenue DeferredTaxAssetsDeferredRevenue	0	USD
CY2012Q4	amrc	Deferred Tax Assets Deferred Revenue DeferredTaxAssetsDeferredRevenue	1336827	USD
CY2011Q4	amrc	Deferred Tax Assets Derivative Instruments Net DeferredTaxAssetsDerivativeInstrumentsNet	2601154	USD
CY2012Q4	amrc	Deferred Tax Assets Derivative Instruments Net DeferredTaxAssetsDerivativeInstrumentsNet	2559448	USD
CY2012Q4	amrc	Deferred Tax Liabilities Contract Refinancing DeferredTaxLiabilitiesContractRefinancing	725328	USD
CY2011Q4	amrc	Deferred Tax Liabilities Contract Refinancing DeferredTaxLiabilitiesContractRefinancing	1029451	USD
CY2012Q4	amrc	Deferred Tax Liabilities Foreign Authority DeferredTaxLiabilitiesForeignAuthority	949850	USD
CY2011Q4	amrc	Deferred Tax Liabilities Foreign Authority DeferredTaxLiabilitiesForeignAuthority	2248078	USD
CY2012Q4	amrc	Deferred Tax Liabliities Acquistion Accounting DeferredTaxLiabliitiesAcquistionAccounting	368878	USD
CY2011Q4	amrc	Deferred Tax Liabliities Acquistion Accounting DeferredTaxLiabliitiesAcquistionAccounting	480341	USD
CY2012	amrc	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2012	amrc	Effective Income Tax Rate Reconciliation Energy Efficiency Preferences EffectiveIncomeTaxRateReconciliationEnergyEfficiencyPreferences	-0.286	Rate
CY2010	amrc	Effective Income Tax Rate Reconciliation Energy Efficiency Preferences EffectiveIncomeTaxRateReconciliationEnergyEfficiencyPreferences	-0.107	Rate
CY2011	amrc	Effective Income Tax Rate Reconciliation Energy Efficiency Preferences EffectiveIncomeTaxRateReconciliationEnergyEfficiencyPreferences	-0.141	Rate
CY2011	amrc	Effective Income Tax Rate Reconciliation State Impact Of Deferred Rate Change Net EffectiveIncomeTaxRateReconciliationStateImpactOfDeferredRateChangeNet	-0.006	Rate
CY2012	amrc	Effective Income Tax Rate Reconciliation State Impact Of Deferred Rate Change Net EffectiveIncomeTaxRateReconciliationStateImpactOfDeferredRateChangeNet	0.000	Rate
CY2010	amrc	Effective Income Tax Rate Reconciliation State Impact Of Deferred Rate Change Net EffectiveIncomeTaxRateReconciliationStateImpactOfDeferredRateChangeNet	0.000	Rate
CY2012	amrc	Finite Lived Intangible Assets Acquired1 FiniteLivedIntangibleAssetsAcquired1	2281240	USD
CY2011	amrc	Goodwill Foreign Currency Translation And Other Adjustments GoodwillForeignCurrencyTranslationAndOtherAdjustments	477281	USD
CY2012	amrc	Goodwill Foreign Currency Translation And Other Adjustments GoodwillForeignCurrencyTranslationAndOtherAdjustments	-934216	USD
CY2012	amrc	Income Before Income Taxes And Unallocated Corporate Expenses IncomeBeforeIncomeTaxesAndUnallocatedCorporateExpenses	18088251	USD
CY2010	amrc	Income Before Income Taxes And Unallocated Corporate Expenses IncomeBeforeIncomeTaxesAndUnallocatedCorporateExpenses	8662872	USD
CY2011	amrc	Income Before Income Taxes And Unallocated Corporate Expenses IncomeBeforeIncomeTaxesAndUnallocatedCorporateExpenses	9712686	USD
CY2011	amrc	Income Tax Reconciliation Nondeductible Expense Deffered Rate Change Net IncomeTaxReconciliationNondeductibleExpenseDefferedRateChangeNet	259339	USD
CY2010	amrc	Income Tax Reconciliation Nondeductible Expense Deffered Rate Change Net IncomeTaxReconciliationNondeductibleExpenseDefferedRateChangeNet	0	USD
CY2012	amrc	Income Tax Reconciliation Nondeductible Expense Deffered Rate Change Net IncomeTaxReconciliationNondeductibleExpenseDefferedRateChangeNet	0	USD
CY2010	amrc	Income Tax Reconciliation Nondeductible Expense Energy Efficiency Preferences IncomeTaxReconciliationNondeductibleExpenseEnergyEfficiencyPreferences	-4246589	USD
CY2012	amrc	Income Tax Reconciliation Nondeductible Expense Energy Efficiency Preferences IncomeTaxReconciliationNondeductibleExpenseEnergyEfficiencyPreferences	-7032798	USD
CY2011	amrc	Income Tax Reconciliation Nondeductible Expense Energy Efficiency Preferences IncomeTaxReconciliationNondeductibleExpenseEnergyEfficiencyPreferences	-6247283	USD
CY2011	amrc	Income Tax Reconciliation Nondeductible Expense Miscellaneous IncomeTaxReconciliationNondeductibleExpenseMiscellaneous	-338139	USD
CY2010	amrc	Income Tax Reconciliation Nondeductible Expense Miscellaneous IncomeTaxReconciliationNondeductibleExpenseMiscellaneous	1276668	USD
CY2012	amrc	Income Tax Reconciliation Nondeductible Expense Miscellaneous IncomeTaxReconciliationNondeductibleExpenseMiscellaneous	343996	USD
CY2010	amrc	Initial Public Offering Allotment Value InitialPublicOfferingAllotmentValue	3188868	USD
CY2012Q4	amrc	Long Term Debt Carrying Value In Excess Of Fair Value LongTermDebtCarryingValueInExcessOfFairValue	3722087	USD
CY2012Q2	amrc	Loss Contingency Related Claims Outstanding LossContingencyRelatedClaimsOutstanding	3900000	USD
CY2012	amrc	Minority Interest In Foreign Subsidiary MinorityInterestInForeignSubsidiary	-91197	USD
CY2011	amrc	Minority Interest In Foreign Subsidiary MinorityInterestInForeignSubsidiary	63614	USD
CY2010Q3	amrc	Number Of Classes Of Common Stock NumberOfClassesOfCommonStock	2	Classes
CY2012Q3	amrc	Number Of Purchase Agreements NumberOfPurchaseAgreements	2	Agreement
	amrc	Partners Capital Account Sale Of Units Net PartnersCapitalAccountSaleOfUnitsNet	25100000	USD
CY2011	amrc	Rebates From Utility Company RebatesFromUtilityCompany	0	USD
CY2012	amrc	Rebates From Utility Company RebatesFromUtilityCompany	1287000	USD
CY2010	amrc	Renewable Energy Expenses RenewableEnergyExpenses	129439629	USD
CY2012	amrc	Renewable Energy Expenses RenewableEnergyExpenses	148167582	USD
CY2011	amrc	Renewable Energy Expenses RenewableEnergyExpenses	146191280	USD
CY2012	amrc	Renewable Energy Revenue RenewableEnergyRevenue	182186573	USD
CY2011	amrc	Renewable Energy Revenue RenewableEnergyRevenue	176876478	USD
CY2010	amrc	Renewable Energy Revenue RenewableEnergyRevenue	162896963	USD
CY2010	amrc	Repurchase Of Stock RepurchaseOfStock	-768970	USD
CY2010	amrc	Unallocated Corporate Expense Segment UnallocatedCorporateExpenseSegment	30721689	USD
CY2011	amrc	Unallocated Corporate Expense Segment UnallocatedCorporateExpenseSegment	39477839	USD
CY2012	amrc	Unallocated Corporate Expense Segment UnallocatedCorporateExpenseSegment	44399958	USD
CY2012	amrc	Uncompleted Contracts Billings To Date UncompletedContractsBillingsToDate	947131616	USD
CY2011	amrc	Uncompleted Contracts Billings To Date UncompletedContractsBillingsToDate	1948515268	USD
CY2011	amrc	Uncompleted Contracts Costs Incurred UncompletedContractsCostsIncurred	1647328123	USD
CY2012	amrc	Uncompleted Contracts Costs Incurred UncompletedContractsCostsIncurred	867232427	USD
CY2012	amrc	Uncompleted Contracts Costs Incurred And Estimated Billings UncompletedContractsCostsIncurredAndEstimatedBillings	986956245	USD
CY2011	amrc	Uncompleted Contracts Costs Incurred And Estimated Billings UncompletedContractsCostsIncurredAndEstimatedBillings	1990783432	USD
CY2011	amrc	Uncompleted Contracts Estimated Earnings UncompletedContractsEstimatedEarnings	343455309	USD
CY2012	amrc	Uncompleted Contracts Estimated Earnings UncompletedContractsEstimatedEarnings	119723818	USD
CY2012	amrc	Write Down Of Long Term Receiveable WriteDownOfLongTermReceiveable	0	USD
CY2011	amrc	Write Down Of Long Term Receiveable WriteDownOfLongTermReceiveable	0	USD
CY2010	amrc	Write Down Of Long Term Receiveable WriteDownOfLongTermReceiveable	2111000	USD
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0001488139
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2012Q2	dei	Entity Public Float EntityPublicFloat	241830692	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	Ameresco, Inc.
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No

Files In Submission

Name	View Source	Status
0001488139-13-000009-index-headers.html	Edgar Link	pending
0001488139-13-000009-index.html	Edgar Link	pending
0001488139-13-000009.txt	Edgar Link	pending
0001488139-13-000009-xbrl.zip	Edgar Link	pending
amrc-20121231.xml	Edgar Link	completed
amrc-20121231.xsd	Edgar Link	pending
amrc-20121231_cal.xml	Edgar Link	unprocessable
amrc-20121231_def.xml	Edgar Link	unprocessable
amrc-20121231_lab.xml	Edgar Link	unprocessable
amrc-20121231_pre.xml	Edgar Link	unprocessable
amrc1231201210-k.htm	Edgar Link	pending
amrc2012spg.jpg	Edgar Link	pending
ex1023q412.htm	Edgar Link	pending
ex211q412.htm	Edgar Link	pending
ex231q412.htm	Edgar Link	pending
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ex321q412.htm	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$AMRC
Ameresco, Inc. Stock $amrc

2012 Q4 Form 10-K Financial Statement

#000148813913000009 Filed on March 18, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMRC Ameresco, Inc. Stock $amrc

2012 Q4 Form 10-K Financial Statement

#000148813913000009 Filed on March 18, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMRC
Ameresco, Inc. Stock $amrc