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Restructuring and Other - Additional Information (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Oct. 01, 2017
USD ($)
Jul. 02, 2017
USD ($)
Apr. 02, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 02, 2016
USD ($)
Apr. 03, 2016
USD ($)
Dec. 31, 2017
USD ($)
Employee
Dec. 31, 2016
USD ($)
Employee
Dec. 31, 2015
USD ($)
Employee
Restructuring Cost and Reserve                    
Contingent consideration adjustment               $ 7,820 $ 15,896 $ 2,489
Severance benefit and charges $ 1,800 $ 600 $ 800 $ 600       $ 1,400    
Lease termination period               2017-09    
Property, Plant and Equipment                    
Restructuring Cost and Reserve                    
Impairment of fixed assets and other expenses                 4,200  
Wireless Test                    
Restructuring Cost and Reserve                    
Lease impairment               $ 1,000    
Semiconductor Test | Property, Plant and Equipment                    
Restructuring Cost and Reserve                    
Impairment of fixed assets and other expenses               1,100    
Impairment of fixed assets and expenses related to the Japan earthquake                    
Restructuring Cost and Reserve                    
Property insurance, recovery   5,100           5,100 5,100  
Impairment of fixed assets and expenses related to the Japan earthquake | Earthquake Related Expenses                    
Restructuring Cost and Reserve                    
Impairment of fixed assets and other expenses   800           800 900  
Universal Robots                    
Restructuring Cost and Reserve                    
Contingent consideration adjustment $ 6,000 $ (300) $ 1,500 $ 600 $ 5,400 $ 8,000 $ 1,200 7,800 15,300 5,300
Acquisition related costs                   1,000
Avionics Interface Technologies, LLC                    
Restructuring Cost and Reserve                    
Contingent consideration adjustment                 600 (1,300)
ZTEC Corporation and Avionics Interface Technologies LLC                    
Restructuring Cost and Reserve                    
Contingent consideration adjustment                   (2,900)
ZTEC Instruments, Inc.                    
Restructuring Cost and Reserve                    
Contingent consideration adjustment                   (1,600)
Semiconductor Test and Wireless Test                    
Restructuring Cost and Reserve                    
Severance benefit and charges                 $ 6,000  
Reduction in employees headcount | Employee                 146  
Semiconductor Test and Wireless Test | Wireless Test                    
Restructuring Cost and Reserve                    
Reduction in employees headcount | Employee                 102  
Semiconductor Test and Wireless Test | Semiconductor Test                    
Restructuring Cost and Reserve                    
Reduction in employees headcount | Employee                 44  
System Test and Semiconductor Test                    
Restructuring Cost and Reserve                    
Severance benefit and charges                   $ 1,500
Reduction in employees headcount | Employee                   23
Semiconductor Test, Industrial Automation and Corporate                    
Restructuring Cost and Reserve                    
Severance benefit and charges               $ 3,800    
Reduction in employees headcount | Employee               91    
Semiconductor Test, Industrial Automation and Corporate | Semiconductor Test                    
Restructuring Cost and Reserve                    
Reduction in employees headcount | Employee               75    
Semiconductor Test, Industrial Automation and Corporate | Industrial Automation                    
Restructuring Cost and Reserve                    
Reduction in employees headcount | Employee               8    
Semiconductor Test, Industrial Automation and Corporate | Corporate                    
Restructuring Cost and Reserve                    
Reduction in employees headcount | Employee               8