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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Oct. 02, 2016
 [2],[4]
Jul. 03, 2016
Apr. 03, 2016
 [2],[5]
Dec. 31, 2015
Oct. 04, 2015
 [8]
Jul. 05, 2015
 [9]
Apr. 05, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Line Items]                        
Goodwill impairment charge $ 0   $ 254,946 [1],[2]           $ 98,897 $ 254,946 $ (254,946) $ 98,897
Intangible assets impairment     83,339 [1],[2]             83,339 98,200  
Intangible assets remaining balance 100,401       $ 239,831         100,401 239,831  
Acquired intangible assets amortization $ 7,923 [2],[3] $ 8,487 $ 16,244 [1],[2] $ 19,994 $ 19,911 [6],[7] $ 20,053 $ 15,258 $ 13,808   52,648 69,031 70,771
System Test                        
Goodwill and Intangible Assets Disclosure [Line Items]                        
Goodwill impairment charge                 $ 0      
Wireless Test                        
Goodwill and Intangible Assets Disclosure [Line Items]                        
Employee reduction, percentage     11.00%                  
Goodwill, fair value     $ 8,000                  
Goodwill impairment charge     254,946             254,946 $ (254,946) $ 98,897
Intangible assets impairment                   $ 83,339    
Intangible assets remaining balance     $ 5,000                  
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 $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.
[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 $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[4] Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[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.