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Earnings (Loss) from Continuing Operations Per Common Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                    
Net income (loss)                 $ (2,399)aeti_IncomeLossFromContinuingOperationsNetOfDividendsOnRedeemableConvertiblePreferredStock [1] $ 4,918aeti_IncomeLossFromContinuingOperationsNetOfDividendsOnRedeemableConvertiblePreferredStock [1]
Weighted average basic shares                 8,182,034us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,990,690us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options and restricted stock units                 0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment [2] 1,481,816us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment [2]
Total weighted average diluted shares with assumed conversions                 8,182,034us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 9,472,506us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings loss from continuing operations per common share:                    
Basic $ (0.25)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.25)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.12us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.09us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.12us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.14us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.14us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.22us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.29)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.62us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Dilutive                 $ (0.29)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.56us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
[1] Net income (loss) represents net income (loss) from continuing operations less the dividends on redeemable convertible preferred stock.
[2] No units or shares are considered when losses cause the effect to be anti-dilutive.