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Computation of Basic and Diluted Net (Loss) Income Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Net Income Loss Per Common Share        
Net income for basic and diluted net income per share $ 97,397 $ 101,037 $ 206,535 $ 188,010
Weighted average common shares-basic 171,241 190,730 172,387 192,992
Incremental shares from assumed conversion of convertible notes [1] 4,364 2,643 3,275 3,520
Convertible note hedge warrant shares 1,778   889 [2] 915 [2]
Employee stock purchase plan 22 43 16 28
Dilutive potential common shares 7,349 4,179 5,394 6,205
Weighted average common shares-diluted 178,590 194,909 177,781 199,197
Net income per common share-basic $ 0.57 $ 0.53 $ 1.20 $ 0.97
Net income per common share-diluted $ 0.55 $ 0.52 $ 1.16 $ 0.94
Restricted Stock Units        
Net Income Loss Per Common Share        
Incremental shares attributable to share based payment arrangements 1,002 1,219 1,012 1,444
Stock Options        
Net Income Loss Per Common Share        
Incremental shares attributable to share based payment arrangements 183 274 202 298
[1] Incremental shares from assumed conversion of the convertible notes were calculated using the difference between the average Teradyne stock price for the period and the conversion price of $31.70, multiplied by 14.5 million 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.
[2] Convertible note hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.78, multiplied by 14.5 million 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.