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Net Income Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Net Income Loss Per Common Share    
Net income for basic net income per share $ 6,589 $ 33,564
Weighted average common shares-basic 189,686 185,838
Incremental shares from assumed conversion of convertible Note 23,386 [1] 23,000 [1]
Convertible note hedge warrant shares 18,859 [2] 18,319 [2]
Restricted stock units 1,123 1,647
Stock options 1,676 2,325
Employee stock purchase rights 27 24
Dilutive potential common shares 45,071 45,315
Weighted average common shares-diluted 234,757 231,153
Net income per common share-basic $ 0.03 $ 0.18
Net income per common share-diluted $ 0.03 $ 0.15
[1] Incremental shares from assumed conversion of the convertible notes for the three months ended March 31, 2013 and April 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 months ended March 31, 2013 and April 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.