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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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Net sales	$ 13,430	$ 13,499	$ 29,278	$ 26,507
Gross profit	2,028	2,089	4,463	4,854
Income from consolidated continuing operations	151	455	649	1,132
Net equity income from foreign joint ventures' operations	932	1,161	1,294	2,568
Foreign joint ventures’ operations related expenses	(178)	(87)	(290)	(138)
Income from consolidated continuing operations and net equity income from foreign joint ventures’ operations	1,083	1,616	1,943	3,700
Gross profit, percentage	15.00%	15.00%	15.00%	18.00%
Income from consolidated continuing operations, percentage	1.00%	3.00%	2.00%	4.00%
Technical Products and Services
Segment Reporting Information [Line Items]
Net sales	12,039	11,157	26,125	21,637
Gross profit	2,004	1,832	4,134	3,689
Income from consolidated continuing operations	1,806	1,630	3,833	3,184
Gross profit, percentage	17.00%	16.00%	16.00%	17.00%
Income from consolidated continuing operations, percentage	15.00%	15.00%	15.00%	15.00%
Electrical and Instrumentation Construction
Segment Reporting Information [Line Items]
Net sales	1,391	2,342	3,153	4,870
Gross profit	24	257	329	1,165
Income from consolidated continuing operations	24	257	329	1,165
Gross profit, percentage	2.00%	11.00%	10.00%	24.00%
Income from consolidated continuing operations, percentage	2.00%	11.00%	10.00%	24.00%
Corporate and other unallocated expenses
Segment Reporting Information [Line Items]
Income from consolidated continuing operations	(1,679)	(1,432)	(3,513)	(3,217)
Income from consolidated continuing operations, percentage	(13.00%)	(11.00%)	(12.00%)	(12.00%)
BOMAY
Segment Reporting Information [Line Items]
Net equity income from foreign joint ventures' operations	960	647	1,508	1,648
MIEFE
Segment Reporting Information [Line Items]
Net equity income from foreign joint ventures' operations	112	138	74	158
AAG
Segment Reporting Information [Line Items]
Net equity income from foreign joint ventures' operations	38	463	2	900
Foreign Operations
Segment Reporting Information [Line Items]
Foreign joint ventures’ operations related expenses	$ (178)	$ (87)	$ (290)	$ (138)

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- Definition

Gross profit percentage.

+ References

No definition available.

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- Definition

Joint venture management related expenses.

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Net equity income from foreign joint ventures.

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- Definition

Operating income percentage.

+ References

No definition available.

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- Definition

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=26872669&loc=d3e20235-122688

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- Definition

This element represents the income or loss from continuing operations (before interest income and interest expense) attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before interest income, interest expense, income taxes, extraordinary items, and noncontrolling interest.

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- Definition

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

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- Definition

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=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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