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Accounting Policies - Financial Data for Variable Interest Entities - Income Statement (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Accounting Policies [Abstract]    
Revenue $ 18,240aegn_VariableInterestEntitiesSummarizedFinancialInformationRevenue $ 20,624aegn_VariableInterestEntitiesSummarizedFinancialInformationRevenue
Gross profit 2,206aegn_VariableInterestEntitiesSummarizedFinancialInformationGrossProfitLoss 1,802aegn_VariableInterestEntitiesSummarizedFinancialInformationGrossProfitLoss
Net income (loss) $ 130aegn_VariableInterestEntitiesSummarizedFinancialInformationNetIncomeLoss $ (571)aegn_VariableInterestEntitiesSummarizedFinancialInformationNetIncomeLoss