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Discontinued Operations - Summary of Financial Results (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
Discontinued Operations And Disposal Groups [Abstract]  
Discontinued Operation, Name of Segment [Extensible List] aeti:MAndIElectricUSOperationsMember
Net sales $ 6,413
Loss from discontinued operations $ (2,859)
Discontinued operations | $ / shares $ (0.33)