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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Oct. 01, 2017
 [5]
Jul. 02, 2017
 [4],[6]
Apr. 02, 2017
 [7]
Dec. 31, 2016
Oct. 02, 2016
 [2],[9]
Jul. 03, 2016
Apr. 03, 2016
 [2],[10]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Line Items]                      
Goodwill $ 252,011       $ 223,343       $ 252,011 $ 223,343 $ 488,413
Goodwill impairment         0   $ 254,946 [1],[2]   0 254,946  
Acquired intangible assets impairment             83,339 [1],[2]     83,339  
Intangible assets remaining balance 79,088       100,401       79,088 100,401  
Acquired intangible assets amortization 7,384 [3],[4] $ 7,028 $ 8,166 $ 7,952 7,923 [2],[8] $ 8,487 $ 16,244 [1],[2] $ 19,994 30,530 52,648 69,031
Wireless Test                      
Goodwill and Intangible Assets Disclosure [Line Items]                      
Employee reduction, percentage             11.00%        
Goodwill 7,976       $ 7,976   $ 8,000   7,976 7,976 $ 262,922
Goodwill impairment             254,900     254,946  
Acquired intangible assets impairment             $ 83,300     $ 83,339  
Intangible assets remaining balance $ 3,600               $ 3,600    
Wireless Test | Sales Revenue, Segment | Customer Concentration Risk | Minimum                      
Goodwill and Intangible Assets Disclosure [Line Items]                      
Concentration risk, percentage             51.00%        
Wireless Test | Sales Revenue, Segment | Customer Concentration Risk | Maximum                      
Goodwill and Intangible Assets Disclosure [Line Items]                      
Concentration risk, percentage             73.00%        
[1] 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.
[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 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.
[4] 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.
[5] 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.
[6] 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.
[7] 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.
[8] Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[9] Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[10] Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.