Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Income Loss Per Common Share
Net income		$ 448,752	$ 715,501	$ 1,014,589
Weighted average common shares-basic		154,310	158,434	164,960
Convertible note hedge warrant shares	[1]	8,897	8,806	9,956
Incremental shares from assumed conversion of convertible notes	[2]	633	1,763	7,435
Employee stock purchase rights		7	22	8
Dilutive potential common shares		9,994	11,300	18,665
Weighted average common shares-diluted		164,304	169,734	183,625
Net income per common share-basic		$ 2.91	$ 4.52	$ 6.15
Net income per common share-diluted		$ 2.73	$ 4.22	$ 5.53
Restricted Stock Units
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		423	657	1,180
Employee Stock Option
Net Income Loss Per Common Share
Incremental shares attributable to share based payment arrangements		34	52	86

[1] Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price, multiplied by the number of warrant shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period.

[2] Incremental shares from the assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price, multiplied by the number of convertible notes shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.