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Discontinued Operations - Summary of Assets and Liabilities Held for Sale (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Discontinued Operations And Disposal Groups [Abstract]            
Discontinued Operation, Name of Segment [Extensible List] aeti:MAndIElectricUSOperationsMember aeti:MAndIElectricUSOperationsMember aeti:MAndIElectricUSOperationsMember aeti:MAndIElectricUSOperationsMember aeti:MAndIElectricUSOperationsMember aeti:MAndIElectricUSOperationsMember
Current assets:            
Cash and cash equivalents     $ 2,858     $ 2,046
Restricted short-term investments     50     50
Accounts receivable-trade, net     5,405     5,266
Inventories, net     1,206     1,325
Cost and estimated earnings in excess of billings on uncompleted contracts     1,973     5,841
Prepaid expenses and other current assets     379     384
Total current portion of assets held for sale     11,871     14,912
Property, plant and equipment, net     6,000     6,323
Intangibles     506     458
Retainage receivables           785
Total non-current assets held for sale     6,506     7,566
Total assets held for sale     18,377     22,478
Current liabilities:            
Accounts payable and other accrued expenses     9,378     11,278
Short-term note payable     116     150
Accrued payroll and benefits     415     338
Billings in excess of costs and estimated earnings on uncompleted contracts     3,801     1,792
Total current liabilities held for sale     13,710     13,558
Total liabilities held for sale     $ 13,710     $ 13,558