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Net Income Per Common Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2013 | Sep. 30, 2012 | Sep. 29, 2013 | Sep. 30, 2012
Net Income Loss Per Common Share |  |  |  |  |  |  |  |
Net income for basic and diluted net income per share | $ 69,459 |  | $ 88,641 |  | $ 142,604 |  | $ 233,592 |
Weighted average common shares-basic | 191,307 |  | 187,364 |  | 190,521 |  | 186,592 |
Incremental shares from assumed conversion of convertible notes | 23,257 | [1] | 21,890 | [1] | 23,303 | [1] | 22,397 | [1]
Convertible note hedge warrant shares | 18,678 | [2] | 16,765 | [2] | 18,742 | [2] | 17,474 | [2]
Restricted stock units | 1,102 |  | 1,423 |  | 1,000 |  | 1,413 |
Stock options | 1,465 |  | 1,735 |  | 1,564 |  | 2,075 |
Employee stock purchase rights | 19 |  | 33 |  | 35 |  | 52 |
Dilutive potential common shares | 44,521 |  | 41,846 |  | 44,644 |  | 43,411 |
Weighted average common shares-diluted | 235,828 |  | 229,210 |  | 235,165 |  | 230,003 |
Net income per common share-basic | $ 0.36 |  | $ 0.47 |  | $ 0.75 |  | $ 1.25 |
Net income per common share-diluted | $ 0.29 |  | $ 0.39 |  | $ 0.61 |  | $ 1.02 |
[1] | Incremental shares from assumed conversion of the convertible notes for the three and nine months ended September 29, 2013 and September 30, 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 nine months ended September 29, 2013 and September 30, 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.

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