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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
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