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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 29, 2019 | [3] | Jun. 30, 2019 | [4] | Mar. 31, 2019 | [5] | Dec. 31, 2018 | Sep. 30, 2018 | [8] | Jul. 01, 2018 | [9] | Apr. 01, 2018 | [10] | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total (benefit) provision for income taxes | $ 23,811 | [1],[2] | $ 15,873 | $ 33,780 | $ (15,159) | $ (32,662) | [6],[7] | $ 20,863 | $ 18,975 | $ 8,846 |  | $ 58,304 | $ 16,022 | $ 266,720 |
Effective tax rate |  |  |  |  |  |  |  |  |  |  |  | 11.10% | 3.40% | 50.90% |
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 related to remeasurement of deferred tax assets and liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,600 |
Expense (benefit) associated with impact of correlative adjustments on tax positions |  |  |  |  |  |  |  |  |  |  |  |  | 2,200 |  |
Tax savings due to the tax holiday |  |  |  |  |  |  |  |  |  |  |  | $ 15,100 | $ 11,900 | $ 24,800 |
Tax savings due to the tax holiday, per share |  |  |  |  |  |  |  |  |  |  |  | $ 0.08 | $ 0.06 | $ 0.12 |
Tax holiday expiration date |  |  |  |  |  |  |  |  |  |  |  | December 31, 2020 |  |  |
Valuation allowance includes net deferred tax assets | 77,177 |  |  |  |  | 69,852 |  |  |  |  |  | $ 77,177 | $ 69,852 |  |
Tax credit carryforwards, approximately |  |  |  |  |  |  |  |  |  |  | 108,400 |  |  | $ 108,400 |
Tax credits carryforwards | 79,480 |  |  |  |  | 69,091 |  |  |  |  |  | 79,480 | 69,091 |  |
Reduction in un recognized tax benefits | 21,180 |  |  |  |  | 43,395 |  |  |  |  | 36,263 | 21,180 | 43,395 | 36,263 | $ 38,958
Unrecognized tax benefits, if recognized would impact effective tax rate | 12,700 |  |  |  |  |  |  |  |  |  |  | 12,700 |  |  |
Unrecognized tax benefits, if recognized would impact deferred taxes | 8,500 |  |  |  |  |  |  |  |  |  |  | 8,500 |  |  |
Accrued interest and penalties | 1,400 |  |  |  |  | 300 |  |  |  |  |  | 1,400 | 300 |  |
Interest and penalties related to income tax, expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | 1,100 | $ 100 | 100 |
Intercompany Cost Sharing Arrangement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total (benefit) provision for income taxes |  |  |  |  |  |  |  |  |  |  |  | 6,300 |  |  |
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credits carryforwards, business |  |  |  |  |  |  |  |  |  |  | 2,100 |  |  | $ 2,100 |
Tax credit carryforward, expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | 2028 |
State and Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisional amount of additional income tax expense |  |  |  |  |  |  |  |  |  |  | 186,000 |  |  |  |
Transition tax on mandatory deemed repatriation of foreign earnings |  |  |  |  |  | $ 51,700 |  |  |  |  |  |  |  |  |
Expense (benefit) associated with impact of correlative adjustments on tax positions |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,300 |
Tax credits carryforwards |  |  |  |  |  |  |  |  |  |  | 106,300 |  |  | $ 106,300 |
Reduction in un recognized tax benefits | $ 21,200 |  |  |  |  |  |  |  |  |  |  | $ 21,200 |  |  |
State and Local Jurisdiction | Earliest Tax Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | 2020 |
State and Local Jurisdiction | Latest Tax Year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | 2039 |
State and Local Jurisdiction | Do Not Expire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credits carryforwards |  |  |  |  |  |  |  |  |  |  | $ 59,700 |  |  | $ 59,700 |
[1] | 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.
[2] | 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.
[3] | 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.
[4] | 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.
[5] | 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.
[6] | 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.
[7] | Teradyne recorded pension and post retirement net actuarial gains of $3.5 million for the fourth quarter in 2018. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[8] | 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.
[9] | 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.
[10] | 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.

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