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Segment Reporting - Selected Financial Details Regarding the Company's Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales | $ 18,146 | $ 17,585 | $ 15,169 | $ 14,430 | $ 15,035 | $ 11,725 | $ 12,872 | $ 14,432 | $ 65,330 | $ 54,065
Gross profit (loss) | 3,572 | 2,867 | 2,396 | 2,980 | 2,490 | 1,689 | 2,172 | 1,772 | 11,815 | 8,123
Income (loss) from domestic operations |  |  |  |  |  |  |  |  | 2,450 | 419
Net equity income from foreign joint ventures' operations |  |  |  |  |  |  |  |  | 2,757 | 2,745
Foreign joint ventures' operations related expenses |  |  |  |  |  |  |  |  | 267 | 343
Income (loss) from domestic operations and net equity income from foreign joint ventures’ operations |  |  |  |  |  |  |  |  | 5,207 | 3,164
Technical Products and Services |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 49,150 | 38,973
Gross profit (loss) |  |  |  |  |  |  |  |  | 9,072 | 6,649
Income (loss) from domestic operations |  |  |  |  |  |  |  |  | 8,061 | 6,012
Electrical and Instrumentation Construction |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 10,089 | 9,196
Gross profit (loss) |  |  |  |  |  |  |  |  | 2,095 | 513
Income (loss) from domestic operations |  |  |  |  |  |  |  |  | 2,096 | 513
American Access Technologies |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 6,091 | 5,896
Gross profit (loss) |  |  |  |  |  |  |  |  | 648 | 961
Income (loss) from domestic operations |  |  |  |  |  |  |  |  | (712) | (484)
Corporate and other unallocated expenses |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Income (loss) from domestic operations |  |  |  |  |  |  |  |  | (6,995) | (5,622)
BOMAY |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Net equity income from foreign joint ventures' operations |  |  |  |  |  |  |  |  | 2,066 | 2,569
MIEFE |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Net equity income from foreign joint ventures' operations |  |  |  |  |  |  |  |  | 115 | 16
AAG |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Net equity income from foreign joint ventures' operations |  |  |  |  |  |  |  |  | 843 | 503
Foreign Operations |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Foreign joint ventures' operations related expenses |  |  |  |  |  |  |  |  | $ 267 | $ 343

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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 + Details
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