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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Oct. 01, 2017
 [3]
Jul. 02, 2017
 [2],[4]
Apr. 02, 2017
 [5]
Dec. 31, 2016
Oct. 02, 2016
 [7],[8]
Jul. 03, 2016
 [7],[9]
Apr. 03, 2016
 [7],[10]
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Line Items]                          
Total (benefit) provision for income taxes $ 204,007,000 [1],[2] $ 24,017,000 $ 31,901,000 $ 6,795,000 $ (7,461,000) [6],[7] $ (4,113,000) $ (7,271,000) $ 7,206,000   $ 266,720,000 $ (11,639,000) $ 46,647,000  
Effective tax rate                   50.90% 21.10% 18.40%  
Corporate tax rate                   35.00% 35.00% 35.00%  
Provisional amount of additional income tax expense 186,000,000                        
Transition tax on mandatory deemed repatriation of foreign earnings                   $ 161,000,000      
Expense related to remeasurement of deferred tax assets and liabilities                   33,600,000      
Benefit associated with impact of correlative adjustments on tax positions                   10,300,000      
Tax savings due to the tax holiday                   $ 24,800,000 $ 17,000,000 $ 11,500,000  
Tax savings due to the tax holiday, per share                   $ 0.12 $ 0.08 $ 0.05  
Tax holiday expiration date                   December 31, 2020      
Valuation allowance amount decrease/increase                   $ 15,600,000      
Valuation allowance resulted from effect of reduction in U.S. Federal corporate tax rate                   11,300,000      
Valuation allowance includes net deferred tax assets 63,919,000       48,369,000         63,919,000 $ 48,369,000    
Tax credit carryforwards, approximately 123,500,000                 123,500,000      
Tax credits carryforwards 76,083,000       57,313,000         76,083,000 57,313,000    
Unrecognized tax benefits 36,263,000       38,958,000         36,263,000 38,958,000 $ 36,792,000 $ 30,418,000
Unrecognized tax benefits, if recognized would impact effective tax rate 24,800,000                 24,800,000      
Unrecognized tax benefits, if recognized would impact deferred taxes 11,500,000                 11,500,000      
Accrued interest and penalties 300,000       $ 400,000         300,000 400,000    
Interest and penalties related to income tax                   100,000 $ 100,000 $ 200,000  
Scenario, Forecast                          
Income Taxes [Line Items]                          
Corporate tax rate                 21.00%        
Do Not Expire                          
Income Taxes [Line Items]                          
Alternative minimum tax credits carryforwards 6,600,000                 6,600,000      
United States                          
Income Taxes [Line Items]                          
Tax credits carryforwards, business 28,300,000                 $ 28,300,000      
United States | Earliest Tax Year                          
Income Taxes [Line Items]                          
Tax credit carryforward, expiration date                   2018      
United States | Latest Tax Year                          
Income Taxes [Line Items]                          
Tax credit carryforward, expiration date                   2037      
State and Local Jurisdiction                          
Income Taxes [Line Items]                          
Tax credits carryforwards 88,600,000                 $ 88,600,000      
State and Local Jurisdiction | Earliest Tax Year                          
Income Taxes [Line Items]                          
Tax credit carryforward, expiration date                   2018      
State and Local Jurisdiction | Latest Tax Year                          
Income Taxes [Line Items]                          
Tax credit carryforward, expiration date                   2037      
State and Local Jurisdiction | Do Not Expire                          
Income Taxes [Line Items]                          
Tax credits carryforwards $ 51,400,000                 $ 51,400,000      
[1] Restructuring and other includes a $6.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, $1.8 million of employee severance charges, and $1.1 million of charges for impairment of fixed assets.
[2] Teradyne recorded pension and post retirement net actuarial gains of $2.5 million and $3.8 million for the second and fourth quarter in 2017, respectively. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[3] Restructuring and other includes $5.1 million of property insurance recovery related to the Japan earthquake, a $0.4 million credit related to previously impaired lease termination of a Wireless Test facility in Sunnyvale, CA, and a $0.3 million credit for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $0.8 million of Japan earthquake related expenses and $0.6 million of employee severance charges.
[4] Restructuring and other includes a $1.5 million charge for a fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.8 million of employee severance charges.
[5] Restructuring and other includes a $1.3 million charge for a lease impairment of a Wireless Test facility in Sunnyvale, CA, a $0.6 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.6 million of employee severance charges.
[6] Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[7] 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.
[8] Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[9] 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 a $1.4 million fair value adjustment to increase contingent consideration liability, of which $0.8 million was related to Universal Robots and $0.6 million was related to AIT, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
[10] Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.