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Discontinued Operations - Analysis of Assets Sold and Liabilities Assumed by Buyer and Related Gain on Sale from Transaction (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 12, 2018
Dec. 31, 2018
Dec. 31, 2017
Discontinued Operations And Disposal Groups [Abstract]      
Discontinued Operation, Name of Segment [Extensible List] aeti:MAndIElectricUSOperationsMember aeti:MAndIElectricUSOperationsMember aeti:MAndIElectricUSOperationsMember
Current assets:      
Accounts receivable-trade, net $ 3,360   $ 5,266
Inventories, net 1,145   1,325
Contract assets 2,957   5,841
Prepaid expenses and other current assets 117   434
Total current portion of assets held for sale 7,579   12,866
Property, plant and equipment, net 5,937   6,323
Intangibles 497   458
Total non-current assets held for sale 6,506   7,566
Total assets held for sale 14,013   20,432
Current liabilities:      
Accounts payable and accrued liabilities 5,664   11,616
Contract liabilities 2,752   1,792
Total current liabilities 8,416   $ 13,471
Net assets sold 5,597    
Proceeds received after payment of transaction costs of $2,180 10,118 $ 10,118  
Gain on disposition $ 4,521