Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Summary of Segment Reporting Information (Detail)

v3.4.0.3
Segment Information - Summary of Segment Reporting Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 02, 2016
Apr. 04, 2015
Dec. 31, 2015
Segment Reporting Information      
Sales $ 159,530 $ 161,638  
Operating profit (loss) 17,599 17,543  
Deductions from Operating Profit      
Interest expense, net of interest income (1,087) (1,246)  
Income before income taxes 16,512 16,297  
Total assets 613,821   $ 609,243
Aerospace      
Segment Reporting Information      
Sales 138,309 142,352  
Test Systems      
Segment Reporting Information      
Sales 21,221 19,286  
Operating Segments      
Segment Reporting Information      
Operating profit (loss) $ 20,901 $ 21,177  
Operating margins (percentage) 13.10% 13.10%  
Operating Segments | Aerospace      
Segment Reporting Information      
Sales $ 138,649 $ 142,352  
Operating profit (loss) $ 18,691 $ 23,402  
Operating margins (percentage) 13.50% 16.40%  
Deductions from Operating Profit      
Total assets $ 513,756   510,884
Operating Segments | Test Systems      
Segment Reporting Information      
Sales 21,221 $ 19,341  
Operating profit (loss) $ 2,210 $ (2,225)  
Operating margins (percentage) 10.40% (11.50%)  
Deductions from Operating Profit      
Total assets $ 75,051   64,934
Intersegment Eliminations | Aerospace      
Segment Reporting Information      
Sales (340) $ 0  
Intersegment Eliminations | Test Systems      
Segment Reporting Information      
Sales 0 (55)  
Segment Reconciling Items      
Deductions from Operating Profit      
Interest expense, net of interest income 1,087 1,246  
Corporate expenses and other 3,302 $ 3,634  
Corporate      
Deductions from Operating Profit      
Total assets $ 25,014   $ 33,425