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Discontinued Operations - Analysis of Supplemental Cash Flow Information of Discontinued Business (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
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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
Depreciation |  | $ 238 | $ 644
Capital expenditures |  | $ 85 | $ 738

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- Definition Disposal group including discontinued operation capital expenditures. + References No definition available. + Details
Name: | aeti_DisposalGroupIncludingDiscontinuedOperationCapitalExpenditures
Namespace Prefix: | aeti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 + Details
Name: | us-gaap_DiscontinuedOperationNameOfSegmentExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | srt-types:extensibleListItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of depreciation and amortization expense attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration