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Discontinued Operations - Condensed Consolidated Statements of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]    
Net increase (decrease) in cash and cash equivalents $ 802us-gaap_NetCashProvidedByUsedInDiscontinuedOperations $ (1,079)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
American Access Technologies, Inc.    
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]    
Net cash (used in) operating activities (1,691)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= aeti_AmericanAccessTechnologiesIncMember
(496)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= aeti_AmericanAccessTechnologiesIncMember
Net cash provided by (used in) investing activities 2,769us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= aeti_AmericanAccessTechnologiesIncMember
[1] (176)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= aeti_AmericanAccessTechnologiesIncMember
[1]
Net cash (used in) financing activities   (58)us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations
/ dei_LegalEntityAxis
= aeti_AmericanAccessTechnologiesIncMember
Advances (to) from parent $ (1,078)aeti_AdvancesToFromParent
/ dei_LegalEntityAxis
= aeti_AmericanAccessTechnologiesIncMember
$ 730aeti_AdvancesToFromParent
/ dei_LegalEntityAxis
= aeti_AmericanAccessTechnologiesIncMember
[1] Includes sale proceeds of $2.3 million.