Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024
Goodwill [Line Items]
Goodwill	$ 1,178,218	$ 1,165,761	$ 1,157,933
Accumulated impairment losses	(762,566)	(762,566)	(762,566)
Foreign currency translation adjustment	(20,285)	12,457
Total Goodwill	415,652	403,195	395,367
Robotics
Goodwill [Line Items]
Goodwill	395,463	383,166	375,298
Accumulated impairment losses	0	0	0
Foreign currency translation adjustment	(20,165)	12,297
Total Goodwill	395,463	383,166	375,298
Semiconductor Test
Goodwill [Line Items]
Goodwill	262,237	262,077	262,117
Accumulated impairment losses	(260,540)	(260,540)	(260,540)
Foreign currency translation adjustment	(120)	160
Total Goodwill	1,697	1,537	1,577
All Other
Goodwill [Line Items]
Goodwill	520,518	520,518	520,518
Accumulated impairment losses	(502,026)	(502,026)	(502,026)
Foreign currency translation adjustment	0	0
Total Goodwill	$ 18,492	$ 18,492	$ 18,492