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Accounting Policies (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Feb. 28, 2014
Accounting Policies [Line Items]            
Accumulated income (loss) related to currency translation adjustments $ (38,800,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax $ 1,000,000us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax        
Accumulated income (loss) related to derivative transactions 0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax (1,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax        
Accumulated income (loss) related to pension activity (500,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (200,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax        
Proceeds from sale of interests in Bayou Coating, L.L.C. 0us-gaap_ProceedsFromDivestitureOfInterestInJointVenture 9,065,000us-gaap_ProceedsFromDivestitureOfInterestInJointVenture        
Equity in earnings of affiliated companies 0us-gaap_IncomeLossFromEquityMethodInvestments 677,000us-gaap_IncomeLossFromEquityMethodInvestments        
Proceeds from equity method investment 0us-gaap_EquityMethodInvestmentDividendsOrDistributions 684,000us-gaap_EquityMethodInvestmentDividendsOrDistributions        
Loss on sale of interests in Bayou Coating, L.L.C. 0us-gaap_GainLossOnSaleOfEquityInvestments 472,000us-gaap_GainLossOnSaleOfEquityInvestments        
Payments to purchase noncontrolling interest 0us-gaap_PaymentsToMinorityShareholders 617,000us-gaap_PaymentsToMinorityShareholders        
Investment in affiliated companies 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures     0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures    
Minimum [Member]            
Accounting Policies [Line Items]            
Equity method investment, ownership percentage 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
Maximum [Member]            
Accounting Policies [Line Items]            
Equity method investment, ownership percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
         
Bayou Coating [Member]            
Accounting Policies [Line Items]            
Percent of book value   49.00%aegn_PercentofBookValue
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember
    49.00%aegn_PercentofBookValue
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember
 
Percent interest by noncontrolling owners   51.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember
       
Equity method investment, non-cash charge, before tax     2,700,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember
     
Equity method investment, non-cash charge, net of tax     1,800,000aegn_EquityMethodInvestmentOtherthanTemporaryImpairmentNetofTax
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember
     
Equity in earnings of affiliated companies   1,200,000us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= aegn_BayouCoatingMember
       
Delta Double Jointing [Member]            
Accounting Policies [Line Items]            
Percent interest by noncontrolling owners           41.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= aegn_DeltaDoubleJointingMember
Percent ownership interest by parent           59.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= aegn_DeltaDoubleJointingMember
Payments to purchase noncontrolling interest   $ 600,000us-gaap_PaymentsToMinorityShareholders
/ dei_LegalEntityAxis
= aegn_DeltaDoubleJointingMember