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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Oct. 02, 2016 | [2],[3] | Jul. 03, 2016 | [2],[4] | Apr. 03, 2016 | [2],[5] | Dec. 31, 2015 | Oct. 04, 2015 | [8] | Jul. 05, 2015 | [9] | Apr. 05, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total (benefit) provision for income taxes | $ (7,461,000) | [1],[2] | $ (4,113,000) | $ (7,271,000) | $ 7,206,000 | $ (8,216,000) | [6],[7] | $ 15,955,000 | $ 29,257,000 | $ 9,651,000 | $ (11,639,000) | $ 46,647,000 | $ 14,104,000 |
Effective tax rate |  |  |  |  |  |  |  |  |  |  | 21.10% | 18.40% | 14.80% |
Tax savings due to the tax holiday |  |  |  |  |  |  |  |  |  |  | $ 17,000,000 | $ 11,500,000 | $ 13,200,000 |
Tax savings due to the tax holiday, per share |  |  |  |  |  |  |  |  |  |  | $ 0.08 | $ 0.05 | $ 0.06 |
Tax holiday expiration date |  |  |  |  |  |  |  |  |  |  | December 31, 2020 |  |  |
Valuation allowance amount decrease/increase |  |  |  |  |  |  |  |  |  |  | $ 5,300,000 |  |  |
Valuation allowance includes net deferred tax assets | 48,369,000 |  |  |  |  | 43,039,000 |  |  |  |  | 48,369,000 | $ 43,039,000 |  |
Tax credit carryforwards, approximately | 134,600,000 |  |  |  |  |  |  |  |  |  | 134,600,000 |  |  |
Tax credits carryforwards | 57,313,000 |  |  |  |  | 44,684,000 |  |  |  |  | 57,313,000 | 44,684,000 |  |
Unrecognized tax benefits | 38,958,000 |  |  |  |  | 36,792,000 |  |  |  |  | 38,958,000 | 36,792,000 | $ 30,418,000 | $ 21,203,000
Unrecognized tax benefits, if recognized would impact effective tax rate | 27,600,000 |  |  |  |  |  |  |  |  |  | 27,600,000 |  |  |
Unrecognized tax benefits, if recognized would impact deferred taxes | 11,400,000 |  |  |  |  |  |  |  |  |  | 11,400,000 |  |  |
Decrease in unrecognized tax benefits | 800,000 |  |  |  |  |  |  |  |  |  | 800,000 |  |  |
Accrued interest and penalties | 400,000 |  |  |  |  | $ 500,000 |  |  |  |  | 400,000 | 500,000 |  |
Interest and penalties related to income tax |  |  |  |  |  |  |  |  |  |  | 100,000 | $ 200,000 | $ 200,000 |
Deferred tax liability not been established | 1,020,000,000 |  |  |  |  |  |  |  |  |  | 1,020,000,000 |  |  |
Do Not Expire |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative minimum tax credits carryforwards | 8,700,000 |  |  |  |  |  |  |  |  |  | 8,700,000 |  |  |
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credits carryforwards, business | 45,300,000 |  |  |  |  |  |  |  |  |  | 45,300,000 |  |  |
Tax credits carryforwards | 39,100,000 |  |  |  |  |  |  |  |  |  | $ 39,100,000 |  |  |
United States | Earliest Tax Year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  |  |  |  |  |  |  | 2017 |  |  |
United States | Latest Tax Year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  |  |  |  |  |  |  | 2036 |  |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credits carryforwards | 80,600,000 |  |  |  |  |  |  |  |  |  | $ 80,600,000 |  |  |
State and Local Jurisdiction | Earliest Tax Year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  |  |  |  |  |  |  | 2017 |  |  |
State and Local Jurisdiction | Latest Tax Year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  |  |  |  |  |  |  | 2031 |  |  |
State and Local Jurisdiction | Do Not Expire |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credits carryforwards | $ 47,400,000 |  |  |  |  |  |  |  |  |  | $ 47,400,000 |  |  |
[1] | Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[2] | Teradyne recorded pension and post retirement net actuarial (gains) losses of $(1.2) million, $(0.7) million, $0.7 million and $(2.0) million for the first, second, third and fourth quarter in 2016, respectively. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[3] | Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[4] | Restructuring and other includes $4.2 million for an impairment of fixed assets, $0.9 million for expenses related to an earthquake in Kumamoto, Japan, and $1.4 million for the increase in the fair value of contingent consideration liability of which $0.8 million related to Universal Robots, and $0.6 million related to AIT, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
[5] | Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[6] | In the fourth quarter ended December 31, 2015, Teradyne recorded pension and post retirement net actuarial losses of $17.7 million. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[7] | Restructuring and other includes a $5.3 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and a $(0.3) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[8] | Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[9] | Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.

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