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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]      
Goodwill acquisition   $ 1,428  
Foreign currency translation adjustment $ 37,577 (8,219)  
Goodwill 1,216,425 1,178,997 $ 1,144,416
Accumulated impairment losses (762,566) (762,566) (762,566)
Goodwill 453,859 416,431 381,850
Autoguide LLC      
Goodwill [Line Items]      
Goodwill acquisition (149) 41,372  
Goodwill 41,223    
Industrial Automation      
Goodwill [Line Items]      
Foreign currency translation adjustment 37,418 (8,247)  
Goodwill 433,752 396,483 363,358
Goodwill 433,752 396,483 363,358
Industrial Automation | Autoguide LLC      
Goodwill [Line Items]      
Goodwill acquisition (149) 41,372  
Wireless Test      
Goodwill [Line Items]      
Goodwill 361,819 361,819 361,819
Accumulated impairment losses (353,843) (353,843) (353,843)
Goodwill 7,976 7,976 7,976
Semiconductor Test      
Goodwill [Line Items]      
Goodwill acquisition   1,428  
Foreign currency translation adjustment 159 28  
Goodwill 262,155 261,996 260,540
Accumulated impairment losses (260,540) (260,540) (260,540)
Goodwill 1,615 1,456  
System Test      
Goodwill [Line Items]      
Goodwill 158,699 158,699 158,699
Accumulated impairment losses (148,183) (148,183) (148,183)
Goodwill $ 10,516 $ 10,516 $ 10,516