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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.