Interest Expense on Teradyne's Senior Notes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt Disclosure [Abstract]
Contractual interest expense on the coupon	$ 0	$ 312
Amortization of the issuance fees recognized as interest expense	0	113
Total interest expense on the convertible debt	$ 0	$ 425