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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Jun. 30, 2024
Goodwill [Line Items]    
Goodwill $ 1,178,218 $ 1,167,676
Accumulated impairment losses (762,566) (762,566)
Foreign currency translation adjustment (10,542)  
Total Goodwill 415,652 405,110
Robotics    
Goodwill [Line Items]    
Goodwill 395,463 385,031
Accumulated impairment losses 0 0
Foreign currency translation adjustment (10,433)  
Total Goodwill 395,463 385,031
Wireless Test    
Goodwill [Line Items]    
Goodwill 361,819 361,819
Accumulated impairment losses (353,843) (353,843)
Foreign currency translation adjustment 0  
Total Goodwill 7,976 7,976
Semiconductor Test    
Goodwill [Line Items]    
Goodwill 262,237 262,128
Accumulated impairment losses (260,540) (260,540)
Foreign currency translation adjustment (109)  
Total Goodwill 1,697 1,588
System Test    
Goodwill [Line Items]    
Goodwill 158,699 158,699
Accumulated impairment losses (148,183) (148,183)
Foreign currency translation adjustment 0  
Total Goodwill $ 10,516 $ 10,516