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Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
 [1],[2]
Sep. 27, 2020
 [2],[3]
Jun. 28, 2020
 [2],[4]
Mar. 29, 2020
 [5]
Dec. 31, 2019
 [6],[7],[8]
Sep. 30, 2019
 [9]
Jun. 30, 2019
 [10]
Mar. 31, 2019
 [11]
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net Income Loss Per Common Share                      
Net income for basic and diluted net income per share $ 196,330 $ 222,718 $ 188,908 $ 176,191 $ 125,075 $ 135,860 $ 97,397 $ 109,138 $ 784,147 $ 467,468 $ 451,779
Weighted average common shares-basic                 166,120 170,425 187,672
Incremental shares from assumed conversion of convertible notes                 8,528 4,909 2,749
Convertible note hedge warrant shares                 6,989 2,698 485
Employee stock purchase rights                 10 13 36
Dilutive potential common shares                 16,922 9,034 4,933
Weighted average common shares-diluted                 183,042 179,459 192,605
Net income per common share-basic $ 1.18 $ 1.34 $ 1.14 $ 1.06 $ 0.75 $ 0.80 $ 0.57 $ 0.63 $ 4.72 $ 2.74 $ 2.41
Net income per common share-diluted $ 1.05 $ 1.21 $ 1.05 $ 0.97 $ 0.69 $ 0.75 $ 0.55 $ 0.62 $ 4.28 $ 2.60 $ 2.35
Restricted Stock Units                      
Net Income Loss Per Common Share                      
Incremental shares attributable to share based payment arrangements                 1,264 1,236 1,385
Stock Options                      
Net Income Loss Per Common Share                      
Incremental shares attributable to share based payment arrangements                 131 178 278
[1] Restructuring and other includes a $15.3 million gain for the decrease in the fair value adjustment to the AutoGuide acquisition contingent consideration liability, and a $0.9 million gain for the decrease in acquisition related compensation liability, partially offset by $1.1 million of employee severance charges primarily in Industrial Automation.
[2] Teradyne recorded pension and post retirement net actuarial (gains) losses of $(0.1) million, $2.7 million, $7.7 million for the second, third and fourth quarter in 2020, respectively. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[3] Restructuring and other includes a $27.2 million gain for the decrease in the fair value of AutoGuide contingent consideration liability, and a $1.1 million gain for the decrease in acquisition related compensation liability, partially offset by $0.5 million recorded for employee severance charges primarily in Industrial Automation.
[4] Restructuring and other includes a $29.9 million charge for the increase in the fair value of the AutoGuide contingent consideration liability, a $4.0 million contract termination settlement charge, $3.1 million of acquisition related compensation and expense and $0.8 million of other expenses, partially offset by a $0.6 million gain for the decrease in the fair value of MiR contingent consideration liability.
[5] Restructuring and other includes a $10.0 million gain for the decrease in the fair value of the AutoGuide and MiR contingent consideration liabilities, partially offset by $1.4 million of acquisition related compensation and expenses and $0.7 million of severance charges related to headcount reductions primarily in Industrial Automation and Semiconductor Test.
[6] Other (income) expense, net includes a $15.0 million charge for the impairment of the investment in RealWear.
[7] Restructuring and other includes a $5.8 million gain for the decrease in the fair value adjustment to the MiR acquisition contingent consideration, partially offset by a $3.0 million fair value adjustment to increase the AutoGuide acquisition contingent consideration, $0.5 million of employee severance charges and $0.2 million of acquisition related expenses and compensation.
[8] Teradyne recorded pension and post retirement net actuarial losses of $7.7 million for the fourth quarter in 2019. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[9] Restructuring and other includes a $7.8 million gain for the decrease in the fair value of MiR contingent consideration liability, partially offset by $0.8 million of employee severance charges and $0.5 million of acquisition related expenses and compensation.
[10] Restructuring and other includes a $11.7 million gain for the decrease in the fair value of the MiR contingent consideration liability, partially offset by $0.8 million of employee severance charges and $0.5 million of acquisition related expenses and compensation.
[11] Restructuring and other includes a $3.0 million fair value adjustment to increase the MiR acquisition contingent consideration, $1.3 million of acquisition related expenses and compensation and $0.8 million of employee severance charges.