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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 | 12 Months Ended
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Dec. 31, 2016 | [1],[2] | Oct. 02, 2016 | [2],[3] | Jul. 03, 2016 | [2],[4] | Apr. 03, 2016 | [2],[5] | Dec. 31, 2015 | [6],[7] | Oct. 04, 2015 | [8] | Jul. 05, 2015 | [9] | Apr. 05, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net Income Loss Per Common Share |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income for basic and diluted net income per share |  | $ 66,345 | $ 63,794 | $ (223,546) | $ 49,986 | $ (641) | $ 71,453 | $ 102,879 | $ 32,787 | $ (43,421) | $ 206,477 | $ 81,272
Weighted average common shares-basic |  |  |  |  |  |  |  |  |  | 202,578 | 211,544 | 202,908
Incremental shares from assumed conversion of convertible notes | [10] |  |  |  |  |  |  |  |  |  |  | 5,013
Convertible note hedge warrant shares | [11] |  |  |  |  |  |  |  |  |  |  | 12,562
Employee stock purchase rights |  |  |  |  |  |  |  |  |  |  | 41 | 31
Dilutive potential common shares |  |  |  |  |  |  |  |  |  |  | 1,777 | 19,642
Weighted average common shares-diluted |  |  |  |  |  |  |  |  |  | 202,578 | 213,321 | 222,550
Net (loss) income per common share-basic |  | $ 0.33 | $ 0.32 | $ (1.10) | $ 0.24 | $ 0.00 | $ 0.34 | $ 0.48 | $ 0.15 | $ (0.21) | $ 0.98 | $ 0.40
Net (loss) income per common share-diluted |  | $ 0.33 | $ 0.31 | $ (1.10) | $ 0.24 | $ 0.00 | $ 0.34 | $ 0.48 | $ 0.15 | $ (0.21) | $ 0.97 | $ 0.37
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Net Income Loss Per Common Share |  |  |  |  |  |  |  |  |  |  |  |
Incremental shares attributable to share based payment arrangements |  |  |  |  |  |  |  |  |  |  | 1,130 | 1,092
Stock Options |  |  |  |  |  |  |  |  |  |  |  |
Net Income Loss Per Common Share |  |  |  |  |  |  |  |  |  |  |  |
Incremental shares attributable to share based payment arrangements |  |  |  |  |  |  |  |  |  |  | 606 | 944
[1] | Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[2] | Teradyne recorded pension and post retirement net actuarial (gains) losses of $(1.2) million, $(0.7) million, $0.7 million and $(2.0) million for the first, second, third and fourth quarter in 2016, respectively. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[3] | Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[4] | Restructuring and other includes $4.2 million for an impairment of fixed assets, $0.9 million for expenses related to an earthquake in Kumamoto, Japan, and $1.4 million for the increase in the fair value of contingent consideration liability of which $0.8 million related to Universal Robots, and $0.6 million related to AIT, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
[5] | Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[6] | In the fourth quarter ended December 31, 2015, Teradyne recorded pension and post retirement net actuarial losses of $17.7 million. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[7] | Restructuring and other includes a $5.3 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and a $(0.3) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[8] | Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[9] | Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[10] | Incremental shares from the assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price of $5.48, multiplied by 34.7 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.
[11] | Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $7.67, multiplied by 34.7 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. Teradyne's call option on its common stock (convertible note hedge transaction) was excluded from the calculation of diluted shares because the effect was anti-dilutive.

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