Quarterly report pursuant to Section 13 or 15(d)

Goodwill - Summary of Changes in Carrying Amount of Goodwill (Detail)

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Goodwill - Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 03, 2015
Oct. 03, 2015
Goodwill [Roll Forward]    
Balance at beginning of period   $ 100,153
Acquisition   16,567
Foreign currency translation   (778)
Balance at end of period $ 115,942 115,942
Goodwill reclassification to intangible assets 1,400  
Operating Segments | Aerospace    
Goodwill [Roll Forward]    
Balance at beginning of period   100,153
Acquisition   16,567
Foreign currency translation   (778)
Balance at end of period 115,942 115,942
Operating Segments | Test Systems    
Goodwill [Roll Forward]    
Balance at beginning of period   0
Acquisition   0
Foreign currency translation   0
Balance at end of period $ 0 $ 0