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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.

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