Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Summary of Segment Reporting Information (Detail)

v3.7.0.1
Segment Information - Summary of Segment Reporting Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Dec. 31, 2016
Sales      
Total Consolidated Sales $ 152,396 $ 159,530  
Operating Profit and Margins      
Total Operating Profit 16,624 17,599  
Deductions from Operating Profit      
Interest Expense, Net of Interest Income 1,133 1,087  
Income Before Income Taxes 15,491 16,512  
Total Assets 603,286   $ 604,344
Aerospace      
Sales      
Total Consolidated Sales 136,827 138,309  
Test Systems      
Sales      
Total Consolidated Sales 15,569 21,221  
Operating Segments      
Operating Profit and Margins      
Total Operating Profit $ 20,072 $ 20,901  
Operating margins 13.20% 13.10%  
Operating Segments | Aerospace      
Sales      
Total Consolidated Sales $ 136,827 $ 138,649  
Operating Profit and Margins      
Total Operating Profit $ 19,754 $ 18,691  
Operating margins 14.40% 13.50%  
Deductions from Operating Profit      
Total Assets $ 511,105   500,892
Operating Segments | Test Systems      
Operating Profit and Margins      
Total Operating Profit $ 318 $ 2,210  
Operating margins 2.00% 10.40%  
Deductions from Operating Profit      
Total Assets $ 74,138   76,575
Intersegment Eliminations | Aerospace      
Sales      
Total Consolidated Sales 0 $ (340)  
Corporate Expenses and Other      
Deductions from Operating Profit      
Corporate Expenses and Other 3,448 $ 3,302  
Total Assets $ 18,043   $ 26,877