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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
Dec. 31, 2018
 [1],[2]
Sep. 30, 2018
 [2],[3]
Jul. 01, 2018
 [2],[4]
Apr. 01, 2018
 [5]
Dec. 31, 2017
 [6],[7]
Oct. 01, 2017
 [7],[8]
Jul. 02, 2017
 [7],[9]
Apr. 02, 2017
 [10]
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net Income Loss Per Common Share                      
Net income (loss) for basic and diluted net income per share $ 143,790 $ 119,978 $ 101,037 $ 86,974 $ (105,923) $ 103,420 $ 174,976 $ 85,221 $ 451,779 $ 257,692 $ (43,421)
Weighted average common shares-basic                 187,672 198,069 202,578
Incremental shares from assumed conversion of convertible notes [11]                 2,749 1,298  
Convertible note hedge warrant shares [12]                 485 112  
Employee stock purchase rights                 36 27 0
Dilutive potential common shares                 4,933 3,572  
Weighted average common shares-diluted                 192,605 201,641 202,578
Net income (loss) per common share-basic $ 0.80 $ 0.65 $ 0.53 $ 0.45 $ (0.54) $ 0.52 $ 0.88 $ 0.43 $ 2.41 $ 1.30 $ (0.21)
Net income (loss) per common share-diluted $ 0.79 $ 0.63 $ 0.52 $ 0.43 $ (0.54) $ 0.52 $ 0.87 $ 0.42 $ 2.35 $ 1.28 $ (0.21)
Restricted Stock Units                      
Net Income Loss Per Common Share                      
Incremental shares attributable to share based payment arrangements                 1,385 1,800  
Stock Options                      
Net Income Loss Per Common Share                      
Incremental shares attributable to share based payment arrangements                 278 335 0
[1] Restructuring and other includes a $17.7 million fair value adjustment to increase the MiR acquisition contingent consideration, $0.8 million of employee severance charges, and $0.5 million acquisition related expenses and compensation, partially offset by a $7.4 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability.
[2] Teradyne recorded pension and post retirement net actuarial (gains) losses of $(0.1) million, $0.3 million and $(3.5) million for the second, third and fourth quarter in 2018, respectively. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[3] Restructuring and other includes $1.7 million of employee severance charges, $0.8 million of acquisition related expenses and compensation, partially offset by a $0.8 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability.
[4] Restructuring and other includes a $5.0 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $3.9 million of employee severance charges and $0.8 million of acquisition related expenses and compensation.
[5] Restructuring and other includes a $3.5 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $2.5 million of acquisition related expenses and compensation and $2.4 million of employee severance charges.
[6] 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.
[7] Teradyne recorded pension and post retirement net actuarial gains of $2.8 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.
[8] 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.
[9] 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.
[10] 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.
[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 $31.70, 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 $39.78, 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.