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Net Income Per Common Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net Income Loss Per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ (16,543) | [1],[2],[3] | $ 88,641 | [4] | $ 111,387 | [5] | $ 33,564 | [6] | $ 129,071 | [7],[8] | $ 56,706 | [9] | $ 88,084 | [10] | $ 70,096 | [11] | $ 217,049 |  | $ 343,957 |  | $ 379,692 |
Income from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,545 | [11] |  |  | 1,545 |  | 5,128 |
Gain on disposal of discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  | (832) | [10] | 25,203 | [11] |  |  | 24,371 |  |  |
Net income or basic net income per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 217,049 |  | 369,873 |  | 384,820 |
Income impact of assumed conversion of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,203 | [12]
Net income for diluted net income per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 217,049 |  | $ 369,873 |  | $ 398,023 |
Weighted average common shares-basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 186,878 |  | 184,683 |  | 179,924 |
Incremental shares from assumed conversion of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,367 | [13] | 21,504 | [13] | 30,848 | [13]
Convertible note hedge warrant shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,433 | [14] | 16,224 | [14] | 10,492 | [14]
Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,291 |  | 3,773 |  | 5,001 |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,213 |  | 566 |  | 443 |
Employee stock purchase rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64 |  | 70 |  | 99 |
Dilutive potential common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,368 |  | 42,137 |  | 46,883 |
Weighted average commons shares-diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 230,246 |  | 226,820 |  | 226,807 |
Net income per common share-basic, Continuing operations | $ (0.09) | [1],[2],[3] | $ 0.47 | [4] | $ 0.60 | [5] | $ 0.18 | [6] | $ 0.70 | [7],[8] | $ 0.31 | [9] | $ 0.48 | [10] | $ 0.38 | [11] | $ 1.16 |  | $ 1.86 |  | $ 2.11 |
Net income per common share-basic, Discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.14 |  | $ 0.03 |
Net income per common share-basic, Total | $ (0.09) | [1],[2],[3] | $ 0.47 | [4] | $ 0.60 | [5] | $ 0.18 | [6] | $ 0.70 | [7],[8] | $ 0.31 | [9] | $ 0.47 | [10] | $ 0.52 | [11] | $ 1.16 |  | $ 2.00 |  | $ 2.14 |
Net income per common share-diluted, Continuing operations | $ (0.09) | [1],[2],[3] | $ 0.39 | [4] | $ 0.49 | [5] | $ 0.15 | [6] | $ 0.58 | [7],[8] | $ 0.26 | [9] | $ 0.38 | [10] | $ 0.30 | [11] | $ 0.94 |  | $ 1.52 |  | $ 1.73 |
Net income per common share-diluted, Discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.11 |  | $ 0.02 |
Net income per common share-diluted, Total | $ (0.09) | [1],[2],[3] | $ 0.39 | [4] | $ 0.49 | [5] | $ 0.15 | [6] | $ 0.58 | [7],[8] | $ 0.26 | [9] | $ 0.38 | [10] | $ 0.42 | [11] | $ 0.94 |  | $ 1.63 |  | $ 1.75 |
[1] | Restructuring and other, net includes a ($0.4) million fair value adjustment to decrease LitePoint acquisition contingent consideration.
[2] | In the fourth quarter ended December 31, 2012, we corrected prior period income tax provision (benefit) errors that resulted in a $0.2 million income tax provision. These errors were not individually or in aggregate material to the fourth quarter of 2012 or any prior period.
[3] | In the fourth quarter ended December 31, 2012, the change in recognizing pension and postretirement benefit plans expense, as a result of the mark-to-market adjustments, decreased gross profit and net income by $8.1 million and $18.3 million, respectively. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[4] | Restructuring and other, net includes $0.7 million of severance charges related to the headcount reductions of 9 people, of which $0.5 million and 7 people were in Systems Test Group, $0.2 million and 2 people were in Wireless Test.
[5] | Restructuring and other, net includes $0.3 million of severance charges related to headcount reductions of 10 people in Semiconductor Test and ($6.5) million fair value adjustment to decrease the LitePoint acquisition contingent consideration.
[6] | Restructuring and other, net includes a ($1.8) million fair value adjustment to decrease the LitePoint acquisition contingent consideration.
[7] | Restructuring and other, net includes $0.5 million of charges related to pension settlement and $3.3 million to the acquisition of LitePoint.
[8] | In the fourth quarter ended December 31, 2011, the change in recognizing pension and postretirement benefit plans expense, as a result of the mark-to-market adjustments, decreased gross profit and net income by $2.4 million and $6.1 million, respectively. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[9] | Restructuring and other, net includes $1.4 million of charges related to the acquisition of LitePoint.
[10] | Restructuring and other, net includes $0.3 million of severance charges related to headcount reductions of approximately 2 people in Semiconductor Test and $0.7 million related to pension settlement charges.
[11] | Restructuring and other, net includes $0.8 million of severance charges related to headcount reductions of approximately 5 people in Semiconductor Test and $(0.4) million credit related to early exit of previously impaired leased facilities in Westford and North Reading, Massachusetts.
[12] | Income impact of convertible notes for 2010 represents interest expense that would have not been recorded if the notes converted at the beginning of the period.
[13] | Incremental shares from assumed conversion of the convertible notes for 2012 and 2011 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 will 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. For 2010, incremental shares from assumed conversion of the convertible notes represent the 34.7 million of shares that will be issued upon conversion.
[14] | Convertible notes hedge warrant shares for 2012, 2011 and 2010 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 will 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. Teradyne's call option on its common stock (convertible note hedge transaction) is excluded from the calculation of diluted shares because the effect would be anti-dilutive. See Note I: "Debt" regarding convertible note hedge transaction.

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