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Changes in Carrying Amount of Goodwill by Segment (Detail)
$ in Thousands
 6 Months Ended
Jul. 05, 2015
USD ($)
Goodwill [Line Items]  
Balance at December 31, 2014 $ 273,438
Goodwill acquired during period 226,501
Foreign currency translation adjustment (4,505)
Balance at July 5, 2015 495,434
Wireless Test  
Goodwill [Line Items]  
Balance at December 31, 2014 262,922
Balance at July 5, 2015 262,922
Industrial Automation  
Goodwill [Line Items]  
Goodwill acquired during period 226,501
Foreign currency translation adjustment (4,505)
Balance at July 5, 2015 221,996
System Test  
Goodwill [Line Items]  
Balance at December 31, 2014 10,516
Balance at July 5, 2015 $ 10,516