Annual report pursuant to Section 13 and 15(d)

Segments - Additional Information (Detail)

v2.4.0.8
Segments - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 31, 2012
Sep. 29, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Customer
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                        
Goodwill $ 100,998,000       $ 21,923,000       $ 100,998,000 $ 21,923,000 $ 17,185,000  
Purchased intangible impairment loss                 0 0    
Goodwill impairment loss                 0 0 2,400,000 0
Sales 105,456,000 89,681,000 70,833,000 73,967,000 67,420,000 68,899,000 64,989,000 65,138,000 339,937,000 266,446,000 228,163,000  
Net Income 6,389,000 7,155,000 5,158,000 8,564,000 5,655,000 4,930,000 5,194,000 6,095,000 27,266,000 21,874,000 21,591,000  
Exchange loss in determining net income                 100,000 100,000 100,000  
Cumulative translation adjustments 1,284,000       1,415,000       1,284,000 1,415,000    
Number of major customers                 2      
Foreign Operations [Member]
                       
Segment Reporting Information [Line Items]                        
Sales                 16,500,000 14,200,000 13,100,000  
Net Income                 200,000 1,000,000 900,000  
Foreign Country [Member]
                       
Segment Reporting Information [Line Items]                        
Net assets 40,100,000       6,700,000       40,100,000 6,700,000    
Aerospace Segment [Member]
                       
Segment Reporting Information [Line Items]                        
Goodwill 101,000,000       21,900,000       101,000,000 21,900,000    
Purchased intangible impairment loss                         
Goodwill impairment loss                         
Test Systems Segment [Member]
                       
Segment Reporting Information [Line Items]                        
Goodwill 0       0       0 0    
Purchased intangible impairment loss                      100,000  
Goodwill impairment loss                      $ 2,400,000