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Discontinued Operations - Assets and Liabilities Held For Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Disposal Group Including Discontinued Operation Balance Sheet Disclosures [Abstract]    
Long-term assets held for sale $ 650us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsNoncurrent $ 650us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsNoncurrent
Total assets held for sale 650us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation 650us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
Net assets and liabilities held for sale $ 650aeti_DisposalGroupIncludingDiscontinuedOperationNetAssetsAndLiabilities $ 650aeti_DisposalGroupIncludingDiscontinuedOperationNetAssetsAndLiabilities