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Commitments and Contingencies (Details) (USD $)
Dec. 31, 2014
Loss Contingencies [Line Items]  
Range of possible loss, minimum $ 0us-gaap_LossContingencyRangeOfPossibleLossMinimum
Range of possible loss, maximum 24,000,000us-gaap_LossContingencyRangeOfPossibleLossMaximum
Brinderson LP [Member]  
Loss Contingencies [Line Items]  
Loss contingency accrual $ 14,500,000us-gaap_LossContingencyAccrualAtCarryingValue
/ dei_LegalEntityAxis
= aegn_BrindersonLPMember