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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] | $ 4,918 aeti_IncomeLossFromContinuingOperationsNetOfDividendsOnRedeemableConvertiblePreferredStock | [1]
Weighted average basic shares |  |  |  |  |  |  |  |  | 8,182,034 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 7,990,690 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Dilutive effect of stock options and restricted stock units |  |  |  |  |  |  |  |  | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | [2] | 1,481,816 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | [2]
Total weighted average diluted shares with assumed conversions |  |  |  |  |  |  |  |  | 8,182,034 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 9,472,506 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Earnings loss from continuing operations per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ (0.25)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.25)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.12 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.12 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.14 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.14 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.22 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.29)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  | $ 0.62 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
Dilutive |  |  |  |  |  |  |  |  | $ (0.29)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ 0.56 us-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.

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- Definition The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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