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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, 2017 | [1],[2] | Oct. 01, 2017 | [3] | Jul. 02, 2017 | [2],[4] | Apr. 02, 2017 | [5] | Dec. 31, 2016 | [6],[7] | Oct. 02, 2016 | [7],[8] | Jul. 03, 2016 | [7],[9] | Apr. 03, 2016 | [7],[10] | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net Income Loss Per Common Share |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) for basic and diluted net income per share |  | $ (105,923) | $ 103,420 | $ 174,976 | $ 85,221 | $ 66,345 | $ 63,794 | $ (223,546) | $ 49,986 | $ 257,692 | $ (43,421) | $ 206,477
Weighted average common shares-basic |  |  |  |  |  |  |  |  |  | 198,069 | 202,578 | 211,544
Incremental shares from assumed conversion of convertible notes | [11] |  |  |  |  |  |  |  |  | 1,298 |  |
Convertible note hedge warrant shares | [12] |  |  |  |  |  |  |  |  | 112 |  |
Employee stock purchase rights |  |  |  |  |  |  |  |  |  | 27 |  | 41
Dilutive potential common shares |  |  |  |  |  |  |  |  |  | 3,572 |  | 1,777
Weighted average common shares-diluted |  |  |  |  |  |  |  |  |  | 201,641 | 202,578 | 213,321
Net income (loss) per common share-basic |  | $ (0.54) | $ 0.52 | $ 0.88 | $ 0.43 | $ 0.33 | $ 0.32 | $ (1.10) | $ 0.24 | $ 1.30 | $ (0.21) | $ 0.98
Net income (loss) per common share-diluted |  | $ (0.54) | $ 0.52 | $ 0.87 | $ 0.42 | $ 0.33 | $ 0.31 | $ (1.10) | $ 0.24 | $ 1.28 | $ (0.21) | $ 0.97
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Net Income Loss Per Common Share |  |  |  |  |  |  |  |  |  |  |  |
Incremental shares attributable to share based payment arrangements |  |  |  |  |  |  |  |  |  | 1,800 |  | 1,130
Stock Options |  |  |  |  |  |  |  |  |  |  |  |
Net Income Loss Per Common Share |  |  |  |  |  |  |  |  |  |  |  |
Incremental shares attributable to share based payment arrangements |  |  |  |  |  |  |  |  |  | 335 |  | 606
[1] | Restructuring and other includes a $6.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, $1.8 million of employee severance charges, and $1.1 million of charges for impairment of fixed assets.
[2] | Teradyne recorded pension and post retirement net actuarial gains of $2.5 million and $3.8 million for the second and fourth quarter in 2017, respectively. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[3] | Restructuring and other includes $5.1 million of property insurance recovery related to the Japan earthquake, a $0.4 million credit related to previously impaired lease termination of a Wireless Test facility in Sunnyvale, CA, and a $0.3 million credit for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $0.8 million of Japan earthquake related expenses and $0.6 million of employee severance charges.
[4] | Restructuring and other includes a $1.5 million charge for a fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.8 million of employee severance charges.
[5] | Restructuring and other includes a $1.3 million charge for a lease impairment of a Wireless Test facility in Sunnyvale, CA, a $0.6 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.6 million of employee severance charges.
[6] | Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[7] | 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.
[8] | Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[9] | 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 a $1.4 million fair value adjustment to increase contingent consideration liability, of which $0.8 million was related to Universal Robots and $0.6 million was related to AIT, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
[10] | Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[11] | 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 $31.80, multiplied by 14.5 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.
[12] | Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.91, multiplied by 14.5 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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