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