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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ 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
Sep. 30, 2019
 [9]
Jun. 30, 2019
 [10]
Mar. 31, 2019
 [11]
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Line Items]                      
Acquired intangible assets amortization $ 5,752 $ 6,219 $ 8,941 $ 9,891 $ 9,784 [6],[7],[8] $ 9,647 $ 10,083 $ 10,634 $ 30,803 $ 40,147 $ 39,191
MiR Reporting Unit Percentage         14.00%         14.00%  
MiR Goodwill Amount         $ 123,600         $ 123,600  
[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.