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Discontinued Operations - Analysis of Results of Operations of Discontinued Business (Detail) - USD ($) $ / shares in Units, $ 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
Net sales		$ 17,899	$ 41,414
Cost of sales		20,358	40,136
Selling, general and administrative expenses		1,660	2,255
Interest expense		1,298	1,054
Loss from discontinued operations		(5,417)	(2,031)
Gain on sale of discontinued operations		4,521
Loss from discontinued operations		$ (896)	$ (2,031)
Earnings (loss) per share information:
Basic and diluted		$ (0.10)	$ (0.24)

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- Definition

Disposal group including discontinued operation selling, general and administrative expenses.

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Indicates business segment that includes component or group of components disposed of or classified as held-for-sale representing strategic shift that has or will have major effect on operation and financial result.

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Amount of costs of goods sold attributable to disposal group, including, but not limited to, discontinued operation.

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Per basic and diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation, when the per share amount is the same.

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