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Segment Information - Selected Financial Details Regarding the Company's Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Revenue	$ 15,169	$ 12,872	$ 29,599	$ 27,304
Gross profit	2,396	2,172	5,376	3,945
Income (loss) from domestic operations	396	168	998	(30)
Foreign operations expenses	(87)	(123)	(138)	(223)
Net equity income from foreign joint ventures' operations	1,161	931	2,568	1,602
Income from domestic operations and net equity income from foreign joint ventures' operations	1,557	1,099	3,566	1,572
Gross profit, percentage	16.00%	17.00%	18.00%	14.00%
Income (loss) from domestic operations, Percentage	3.00%	1.00%	3.00%	0.00%
Technical Products and Services [Member]
Segment Reporting Information [Line Items]
Revenue	11,157	8,647	21,637	18,470
Gross profit	1,832	1,587	3,689	2,957
Income (loss) from domestic operations	1,630	1,448	3,184	2,553
Gross profit, percentage	17.00%	18.00%	17.00%	16.00%
Income (loss) from domestic operations, Percentage	15.00%	17.00%	15.00%	14.00%
Electrical and Instrumentation Construction [Member]
Segment Reporting Information [Line Items]
Revenue	2,342	2,615	4,870	5,607
Gross profit	257	330	1,165	532
Income (loss) from domestic operations	257	330	1,165	532
Gross profit, percentage	11.00%	13.00%	24.00%	9.00%
Income (loss) from domestic operations, Percentage	11.00%	13.00%	24.00%	9.00%
American Access Technologies [Member]
Segment Reporting Information [Line Items]
Revenue	1,670	1,610	3,092	3,227
Gross profit	307	255	522	456
Income (loss) from domestic operations	(60)	(115)	(135)	(303)
Gross profit, percentage	19.00%	16.00%	17.00%	14.00%
Income (loss) from domestic operations, Percentage	(4.00%)	(7.00%)	(4.00%)	(9.00%)
Corporate and other unallocated expenses [Member]
Segment Reporting Information [Line Items]
Income (loss) from domestic operations	(1,431)	(1,495)	(3,216)	(2,812)
Income (loss) from domestic operations, Percentage	(9.00%)	(12.00%)	(11.00%)	(10.00%)
BOMAY [Member]
Segment Reporting Information [Line Items]
Net equity income from foreign joint ventures' operations	647	1,062	1,648	1,761
MIEFE [Member]
Segment Reporting Information [Line Items]
Net equity income from foreign joint ventures' operations	138	11	158	20
AAG [Member]
Segment Reporting Information [Line Items]
Net equity income from foreign joint ventures' operations	463	(19)	900	44
Foreign Operations [Member]
Segment Reporting Information [Line Items]
Foreign operations expenses	$ (87)	$ (123)	$ (138)	$ (223)

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Gross Profit Percentage

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Income (loss) from domestic operations and net equity income from foreign joint ventures.

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Joint venture management related expenses.

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Net equity income from foreign joint ventures.

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Operating Income Loss Percentage

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1,2)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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The net result for the period of deducting operating expenses from operating revenues.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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-Article 5

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