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Net Income Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Jun. 30, 2013
Jul. 01, 2012
Net Income Loss Per Common Share        
Net income for basic and diluted net income per share $ 66,556 $ 111,387 $ 73,145 $ 144,951
Weighted average common shares-basic 190,569 186,573 190,128 186,205
Incremental shares from assumed conversion of convertible notes 23,266 [1] 22,301 [1] 23,326 [1] 22,651 [1]
Convertible note hedge warrant shares 18,689 [2] 17,340 [2] 18,774 [2] 17,829 [2]
Restricted stock units 772 1,171 947 1,405
Stock options 1,554 2,160 1,615 2,247
Employee stock purchase rights 59 101 43 62
Dilutive potential common shares 44,340 43,073 44,705 44,194
Weighted average common shares-diluted 234,909 229,646 234,833 230,399
Net income per common share-basic $ 0.35 $ 0.60 $ 0.38 $ 0.78
Net income per common share-diluted $ 0.28 $ 0.49 $ 0.31 $ 0.63
[1] Incremental shares from assumed conversion of the convertible notes for the three and six months ended June 30, 2013 and July 1, 2012 are calculated using the difference between the average Teradyne stock price for the period and the conversion price of $5.48, multiplied by the 34.7 million shares that would be issued upon conversion. The result of this calculation, representing the total intrinsic value of the convertible debt, is divided by the average Teradyne stock price for the period.
[2] Convertible note hedge warrant shares for the three and six months ended June 30, 2013 and July 1, 2012 are calculated using the difference between the average Teradyne stock price for the period and the warrant price of $7.67, multiplied by the 34.7 million shares that would be issued upon conversion. The result of this calculation, representing the total intrinsic value of the warrant, is divided by the average Teradyne stock price for the period.