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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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