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Income Taxes - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
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, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Line Items]                          
Total (benefit) provision for income taxes $ 26,595 [1],[2] $ 41,013 $ 28,383 $ 20,878 $ 23,811 [6],[7],[8] $ 15,873 $ 33,780 $ (15,159)   $ 116,868 $ 58,304 $ 16,022  
Effective tax rate                   13.00% 11.10% 3.40%  
Provisional amount of additional income tax expense                 $ 49,500       $ 186,000
Transition tax on mandatory deemed repatriation of foreign earnings                       $ 51,700 161,000
Expense (benefit) associated with impact of correlative adjustments on tax positions                       2,200  
Tax savings due to the tax holiday                   $ 29,900 $ 15,100 $ 11,900  
Tax savings due to the tax holiday, per share                   $ 0.16 $ 0.08 $ 0.06  
Tax holiday expiration date                   December 31, 2025      
Valuation allowance includes net deferred tax assets 84,962       77,177         $ 84,962 $ 77,177    
Tax credit carryforwards, approximately                         116,300
Tax credits carryforwards 87,595       79,480         87,595 79,480    
Reduction in unrecognized tax benefits 17,903       21,180       $ 43,395 17,903 21,180 $ 43,395 36,263
Unrecognized tax benefits, if recognized would impact effective tax rate 12,000                 12,000      
Unrecognized tax benefits, if recognized would impact deferred taxes 5,900                 5,900      
Accrued interest and penalties 1,200       $ 1,400         1,200 1,400    
Interest and penalties related to income tax, expense (benefit)                   200 1,100 $ 100  
Expense related to remeasurement of deferred tax assets and liabilities                   33,600      
Possible Lapse Of Statutes Of Limitations [Member]                          
Income Taxes [Line Items]                          
Decrease in Unrecognized Tax Benefits is Reasonably Possible 1,600                 1,600      
InterCompany Cost Sharing Arrangement [Member]                          
Income Taxes [Line Items]                          
Total (benefit) provision for income taxes                   2,300 $ 6,300    
United States                          
Income Taxes [Line Items]                          
Tax credits carryforwards, business                         $ 1,900
Tax credit carryforward, expiration date                         2028
State and Local Jurisdiction                          
Income Taxes [Line Items]                          
Provisional amount of additional income tax expense                         $ 186,000
Expense (benefit) associated with impact of correlative adjustments on tax positions                         10,300
Tax credits carryforwards                         $ 114,300
Reduction in unrecognized tax benefits $ 17,900                 $ 17,900      
State and Local Jurisdiction | Earliest Tax Year                          
Income Taxes [Line Items]                          
Tax credit carryforward, expiration date                         2021
State and Local Jurisdiction | Latest Tax Year                          
Income Taxes [Line Items]                          
Tax credit carryforward, expiration date                         2040
State and Local Jurisdiction | Do Not Expire                          
Income Taxes [Line Items]                          
Tax credits carryforwards                         $ 63,800
[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.