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Note 2 - Accounting Policies (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 12 Months Ended 9 Months Ended 24 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2013
USD ($)
Jun. 30, 2013
EUR (€)
Sep. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2013
EUR (€)
Jun. 30, 2013
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
segment
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Sep. 30, 2014
Minimum [Member]
Dec. 31, 2014
Minimum [Member]
Dec. 31, 2013
Minimum [Member]
Sep. 30, 2014
Maximum [Member]
Dec. 31, 2014
Maximum [Member]
Dec. 31, 2013
Maximum [Member]
Sep. 30, 2013
Insituform Germany [Member]
Dec. 31, 2013
WCU [Member]
Dec. 31, 2014
Bayou [Member]
USD ($)
Sep. 30, 2014
Bayou [Member]
USD ($)
Sep. 30, 2014
Bayou [Member]
USD ($)
Sep. 30, 2014
Fyfe LA [Member]
USD ($)
Mar. 31, 2014
Delta Double Jointing [Member]
Sep. 30, 2014
Bayou Delta [Member]
USD ($)
Sep. 30, 2014
FRANCE
USD ($)
Sep. 30, 2014
MALAYSIA
USD ($)
Sep. 30, 2014
INDIA
USD ($)
Sep. 30, 2014
Europe [Member]
USD ($)
Dec. 31, 2014
CRTS [Member]
USD ($)
Sep. 30, 2014
CRTS [Member]
USD ($)
Sep. 30, 2013
CRTS [Member]
Sep. 30, 2014
Bayou Coating [Member]
USD ($)
Mar. 31, 2014
Bayou Coating [Member]
USD ($)
Sep. 30, 2013
Bayou Coating [Member]
USD ($)
Dec. 31, 2014
Bayou Coating [Member]
USD ($)
Dec. 31, 2013
Bayou Coating [Member]
USD ($)
Dec. 31, 2012
Bayou Coating [Member]
USD ($)
Sep. 30, 2014
Asia Pacific [Member]
USD ($)
Sep. 30, 2014
Fyfe [Member]
USD ($)
Dec. 31, 2014
Fyfe [Member]
USD ($)
Jun. 30, 2015
Scenario, Forecast [Member]
USD ($)
Jun. 30, 2015
Scenario, Forecast [Member]
GBP (£)
Dec. 31, 2014
Fyfe Asia [Member]
USD ($)
Dec. 31, 2013
Fyfe Asia [Member]
USD ($)
Dec. 31, 2014
Infrastructure Solutions [Member]
USD ($)
Dec. 31, 2013
Infrastructure Solutions [Member]
USD ($)
Dec. 31, 2014
Infrastructure Solutions [Member]
Fyfe Asia [Member]
USD ($)
Dec. 31, 2014
Infrastructure Solutions [Member]
Fyfe Asia [Member]
USD ($)
Note 2 - Accounting Policies [Line Items]                                                                                                    
PercentOfBookValue                                                                     49.00%aegn_PercentOfBookValue
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember		                              
Tangible Asset Impairment Charges     $ 11,870,000us-gaap_TangibleAssetImpairmentCharges       $ 1,100,000us-gaap_TangibleAssetImpairmentCharges                             $ 10,900,000us-gaap_TangibleAssetImpairmentCharges
/ dei_LegalEntityAxis
= aegn_BayouMember		       $ 400,000us-gaap_TangibleAssetImpairmentCharges
/ dei_LegalEntityAxis
= aegn_BayouDeltaMember		 $ 200,000us-gaap_TangibleAssetImpairmentCharges
/ dei_LegalEntityAxis
= country_FR		 $ 300,000us-gaap_TangibleAssetImpairmentCharges
/ dei_LegalEntityAxis
= country_MY		 $ 100,000us-gaap_TangibleAssetImpairmentCharges
/ dei_LegalEntityAxis
= country_IN		                                          
Weighted Average Number of Dilutive Shares Excluded                 318,059aegn_WeightedAverageNumberofDilutiveSharesExcluded                                                                                  
Number of Reportable Segments                 3us-gaap_NumberOfReportableSegments                                                                                  
Retainage, Percent of Contract Value Withheld                             5.00%aegn_RetainagePercentofContractValueWithheld
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		     15.00%aegn_RetainagePercentofContractValueWithheld
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                                                                
Research and Development Expense                   2,600,000us-gaap_ResearchAndDevelopmentExpense 2,600,000us-gaap_ResearchAndDevelopmentExpense 1,800,000us-gaap_ResearchAndDevelopmentExpense                                                                            
Fair Value Inputs, Discount Rate                         13.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 12.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		   16.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 16.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		       13.50%us-gaap_FairValueInputsDiscountRate
/ dei_LegalEntityAxis
= aegn_BayouMember		   13.50%us-gaap_FairValueInputsDiscountRate
/ dei_LegalEntityAxis
= aegn_BayouMember		             14.00%us-gaap_FairValueInputsDiscountRate
/ dei_LegalEntityAxis
= us-gaap_EuropeMember		 13.50%us-gaap_FairValueInputsDiscountRate
/ dei_LegalEntityAxis
= aegn_CRTSMember		 13.50%us-gaap_FairValueInputsDiscountRate
/ dei_LegalEntityAxis
= aegn_CRTSMember		 13.00%us-gaap_FairValueInputsDiscountRate
/ dei_LegalEntityAxis
= aegn_CRTSMember		             14.00%us-gaap_FairValueInputsDiscountRate
/ dei_LegalEntityAxis
= us-gaap_AsiaPacificMember		 16.00%us-gaap_FairValueInputsDiscountRate
/ dei_LegalEntityAxis
= aegn_FyfeMember		                  
Compound Annual Growth Rate Assumption                         2.00%aegn_CompoundAnnualGrowthRateAssumption
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 1.00%aegn_CompoundAnnualGrowthRateAssumption
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		   7.00%aegn_CompoundAnnualGrowthRateAssumption
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 20.00%aegn_CompoundAnnualGrowthRateAssumption
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		       4.00%aegn_CompoundAnnualGrowthRateAssumption
/ dei_LegalEntityAxis
= aegn_BayouMember		   5.00%aegn_CompoundAnnualGrowthRateAssumption
/ dei_LegalEntityAxis
= aegn_BayouMember		             5.00%aegn_CompoundAnnualGrowthRateAssumption
/ dei_LegalEntityAxis
= us-gaap_EuropeMember		 3.80%aegn_CompoundAnnualGrowthRateAssumption
/ dei_LegalEntityAxis
= aegn_CRTSMember		 6.50%aegn_CompoundAnnualGrowthRateAssumption
/ dei_LegalEntityAxis
= aegn_CRTSMember		               5.00%aegn_CompoundAnnualGrowthRateAssumption
/ dei_LegalEntityAxis
= us-gaap_AsiaPacificMember		 10.00%aegn_CompoundAnnualGrowthRateAssumption
/ dei_LegalEntityAxis
= aegn_FyfeMember		                  
Goodwill, Impairment Loss                 51,512,000us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss                                       5,700,000us-gaap_GoodwillImpairmentLoss
/ dei_LegalEntityAxis
= aegn_CRTSMember		                               29,700,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= aegn_InfrastructureSolutionsMember		   (29,700,000)us-gaap_GoodwillImpairmentLoss
/ us-gaap_BusinessAcquisitionAxis
= aegn_FyfeAsiaMember
/ us-gaap_StatementBusinessSegmentsAxis
= aegn_InfrastructureSolutionsMember		 16,069,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_BusinessAcquisitionAxis
= aegn_FyfeAsiaMember
/ us-gaap_StatementBusinessSegmentsAxis
= aegn_InfrastructureSolutionsMember
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax     (23,400,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax   600,000us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax     (23,400,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax                                                                                    
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax     (700,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax   1,200,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax     (700,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax                                                                                    
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax     (500,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax   200,000us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax     (500,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax                                                                                    
Noncontrolling Interest, Ownership Percentage by Parent 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent         50.00%us-gaap_MinorityInterestOwnershipPercentageByParent                       50.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aegn_InsituformGermanyMember		           59.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= aegn_DeltaDoubleJointingMember		                                                  
Business Combination, Consideration Transferred 18,300,000us-gaap_BusinessCombinationConsiderationTransferred1 14,000,000us-gaap_BusinessCombinationConsiderationTransferred1     18,300,000us-gaap_BusinessCombinationConsiderationTransferred1 14,000,000us-gaap_BusinessCombinationConsiderationTransferred1                                                                                        
Gain (Loss) on Disposition of Business 11,300,000us-gaap_GainLossOnSaleOfBusiness       11,300,000us-gaap_GainLossOnSaleOfBusiness       (516,000)us-gaap_GainLossOnSaleOfBusiness 0us-gaap_GainLossOnSaleOfBusiness 0us-gaap_GainLossOnSaleOfBusiness                                                                              
Business Acquisition, Transaction Costs 500,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts       500,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts   500,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts                                                                                      
Long-term Purchase Commitment, Amount (in Pounds)                                                                                     3,600,000us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		 2,300,000us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                                       49.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aegn_WCUMember		         41.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= aegn_DeltaDoubleJointingMember		                   51.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember		                              
Payments to Noncontrolling Interests       617,000us-gaap_PaymentsToMinorityShareholders         617,000us-gaap_PaymentsToMinorityShareholders 287,000us-gaap_PaymentsToMinorityShareholders 5,000us-gaap_PaymentsToMinorityShareholders                                                                              
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures                 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 9,101,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures                                                                                
Fair Value Inputs, Long-term Revenue Growth Rate                         2.50%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 1.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		   3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 3.50%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		       3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ dei_LegalEntityAxis
= aegn_BayouMember		   3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ dei_LegalEntityAxis
= aegn_BayouMember		             2.50%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ dei_LegalEntityAxis
= us-gaap_EuropeMember		 3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ dei_LegalEntityAxis
= aegn_CRTSMember		 3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ dei_LegalEntityAxis
= aegn_CRTSMember		               3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ dei_LegalEntityAxis
= us-gaap_AsiaPacificMember		 4.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ dei_LegalEntityAxis
= aegn_FyfeMember		                  
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount                                         9.50%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ dei_LegalEntityAxis
= aegn_BayouMember		 10.20%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ dei_LegalEntityAxis
= aegn_BayouMember		 10.20%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ dei_LegalEntityAxis
= aegn_BayouMember		             9.30%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_EuropeMember		 13.80%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ dei_LegalEntityAxis
= aegn_CRTSMember		 2.50%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ dei_LegalEntityAxis
= aegn_CRTSMember		               12.10%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_AsiaPacificMember		 6.20%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ dei_LegalEntityAxis
= aegn_FyfeMember		                  
Reporting Unit, Change in Fair Value, Value                                         0aegn_ReportingUnitChangeinFairValueValue
/ dei_LegalEntityAxis
= aegn_BayouMember		   (48,000,000)aegn_ReportingUnitChangeinFairValueValue
/ dei_LegalEntityAxis
= aegn_BayouMember		             (8,200,000)aegn_ReportingUnitChangeinFairValueValue
/ dei_LegalEntityAxis
= us-gaap_EuropeMember		 5,400,000aegn_ReportingUnitChangeinFairValueValue
/ dei_LegalEntityAxis
= aegn_CRTSMember		 3,800,000aegn_ReportingUnitChangeinFairValueValue
/ dei_LegalEntityAxis
= aegn_CRTSMember		               (18,000,000)aegn_ReportingUnitChangeinFairValueValue
/ dei_LegalEntityAxis
= us-gaap_AsiaPacificMember		 40,100,000aegn_ReportingUnitChangeinFairValueValue
/ dei_LegalEntityAxis
= aegn_FyfeMember		                  
Reporting Unit, Change in Fair Value, Percent                                             (30.90%)aegn_ReportingUnitChangeinFairValuePercent
/ dei_LegalEntityAxis
= aegn_BayouMember		             (9.50%)aegn_ReportingUnitChangeinFairValuePercent
/ dei_LegalEntityAxis
= us-gaap_EuropeMember		 10.50%aegn_ReportingUnitChangeinFairValuePercent
/ dei_LegalEntityAxis
= aegn_CRTSMember		 6.80%aegn_ReportingUnitChangeinFairValuePercent
/ dei_LegalEntityAxis
= aegn_CRTSMember		               (36.40%)aegn_ReportingUnitChangeinFairValuePercent
/ dei_LegalEntityAxis
= us-gaap_AsiaPacificMember		 20.70%aegn_ReportingUnitChangeinFairValuePercent
/ dei_LegalEntityAxis
= aegn_FyfeMember		                  
Goodwill                 293,023,000us-gaap_Goodwill 348,680,000us-gaap_Goodwill                     0us-gaap_Goodwill
/ dei_LegalEntityAxis
= aegn_BayouMember		 29,700,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= aegn_BayouMember		 29,700,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= aegn_BayouMember		             20,400,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_EuropeMember		 14,400,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= aegn_CRTSMember		 20,100,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= aegn_CRTSMember		               5,300,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_AsiaPacificMember		 66,500,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= aegn_FyfeMember		 50,200,000us-gaap_Goodwill
/ dei_LegalEntityAxis
= aegn_FyfeMember		     21,106,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= aegn_FyfeAsiaMember		 20,008,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= aegn_FyfeAsiaMember		 177,300,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= aegn_InfrastructureSolutionsMember		 195,570,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= aegn_InfrastructureSolutionsMember		    
Contract Receivable Retainage, Due after Next Twelve Months                   10.00%aegn_ContractReceivableRetainageDueafterNextTwelveMonthsPercent                                                                                
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount                 164,014us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 318,026us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 223,536us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount                                                                              
Impairment of Intangible Assets, Finite-lived                 12,116,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived                     10,896,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ dei_LegalEntityAxis
= aegn_BayouMember		   1,200,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ dei_LegalEntityAxis
= aegn_FyfeLAMember		                                                    
Proceeds from Divestiture of Interest in Joint Venture       9,065,000us-gaap_ProceedsFromDivestitureOfInterestInJointVenture                                                                 9,065,000us-gaap_ProceedsFromDivestitureOfInterestInJointVenture
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember		 0us-gaap_ProceedsFromDivestitureOfInterestInJointVenture
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember		 0us-gaap_ProceedsFromDivestitureOfInterestInJointVenture
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember		                      
Equity Method Investment, Other than Temporary Impairment                                                                       2,700,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember		                            
EquityMethodInvestmentOtherThanTemporaryImpairmentNetOfTax                                                                       1,800,000aegn_EquityMethodInvestmentOtherThanTemporaryImpairmentNetOfTax
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember		                            
Income (Loss) from Equity Method Investments                 570,000us-gaap_IncomeLossFromEquityMethodInvestments [1] 5,159,000us-gaap_IncomeLossFromEquityMethodInvestments [2] 6,359,000us-gaap_IncomeLossFromEquityMethodInvestments [2]                                             1,200,000us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember		 1,200,000us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember		                              
Proceeds from Equity Method Investment, Dividends or Distributions       684,000us-gaap_EquityMethodInvestmentDividendsOrDistributions       684,000us-gaap_EquityMethodInvestmentDividendsOrDistributions 590,000us-gaap_EquityMethodInvestmentDividendsOrDistributions 10,691,000us-gaap_EquityMethodInvestmentDividendsOrDistributions 11,034,000us-gaap_EquityMethodInvestmentDividendsOrDistributions                                                                              
Gain (Loss) on Sale of Equity Investments                                                                         $ (472,000)us-gaap_GainLossOnSaleOfEquityInvestments
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember		 $ 0us-gaap_GainLossOnSaleOfEquityInvestments
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember		 $ 0us-gaap_GainLossOnSaleOfEquityInvestments
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember		                      
[1] Bayou Coating was sold in March 2014. Income statement data in 2014 includes only those results up to the date of its sale.
[2] Includes the financial data of Insituform-Germany through the date of its sale in June 2013.