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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2022
Goodwill [Line Items]      
Goodwill $ 1,188,590 $ 1,216,425 $ 1,165,761
Accumulated impairment losses (762,566) (762,566) (762,566)
Foreign currency translation adjustment (22,829) (27,835)  
Total Goodwill 426,024 453,859 403,195
Robotics      
Goodwill [Line Items]      
Goodwill 405,971 433,752 383,166
Foreign currency translation adjustment (22,805) (27,781)  
Total Goodwill 405,971 433,752 383,166
Wireless Test      
Goodwill [Line Items]      
Goodwill 361,819 361,819 361,819
Accumulated impairment losses (353,843) (353,843) (353,843)
Foreign currency translation adjustment   0  
Total Goodwill 7,976 7,976 7,976
Semiconductor Test      
Goodwill [Line Items]      
Goodwill 262,101 262,155 262,077
Accumulated impairment losses (260,540) (260,540) (260,540)
Foreign currency translation adjustment (24) (54)  
Total Goodwill 1,561 1,615 1,537
System Test      
Goodwill [Line Items]      
Goodwill 158,699 158,699 158,699
Accumulated impairment losses (148,183) (148,183) (148,183)
Foreign currency translation adjustment   0  
Total Goodwill $ 10,516 $ 10,516 $ 10,516