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Restructuring and Other - Additional Information (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Oct. 04, 2015
USD ($)
Jul. 05, 2015
USD ($)
Sep. 28, 2014
USD ($)
Dec. 31, 2015
USD ($)
Employee
Dec. 31, 2014
USD ($)
Employee
Dec. 31, 2013
USD ($)
Employee
Restructuring Cost and Reserve              
Other restructuring charges         $ 3,600    
Contingent consideration adjustment         2,489 $ (630)  
Severance benefit and charges         400    
System Test and Semiconductor Test              
Restructuring Cost and Reserve              
Severance benefit and charges         $ 1,500   $ 1,900
Reduction in employees headcount | Employee         23   48
Corporate And Eliminations              
Restructuring Cost and Reserve              
Change in estimated exit costs related to leased facility             $ (400)
Semiconductor Test and Wireless Test              
Restructuring Cost and Reserve              
Severance benefit and charges           $ 1,600  
Reduction in employees headcount | Employee           43  
ZTEC Instruments, Inc.              
Restructuring Cost and Reserve              
Contingent consideration adjustment     $ (1,600) $ (630) $ (1,600) $ (630)  
Avionics Interface Technologies, LLC              
Restructuring Cost and Reserve              
Contingent consideration adjustment $ (300) $ (1,000)     (1,250)    
Acquisition related costs           $ 372  
Universal Robots              
Restructuring Cost and Reserve              
Contingent consideration adjustment $ 5,339       5,339    
Acquisition related costs         1,104    
ZTEC Corporation and Avionics Interface Technologies LLC              
Restructuring Cost and Reserve              
Contingent consideration adjustment         $ (2,900)