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Non-Financial Assets Measured at Fair Value on Non-Recurring Basis (Parenthetical) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Jul. 03, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Goodwill, carrying value $ 985,909   $ 1,014,577 $ 985,909 $ 996,033
Goodwill, impairment loss 0 $ 254,946 [1],[2] 0 254,946  
Definite lived intangible assets, carrying value 414,038   414,038 414,038  
Definite lived intangible assets, impairment loss   83,339 [1],[2]   83,339  
Wireless Test          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Goodwill, carrying value $ 361,819   $ 361,819 361,819 $ 361,819
Goodwill, impairment loss   254,900   254,946  
Definite lived intangible assets, impairment loss   83,300   $ 83,339  
Fair Value, Measurements, Nonrecurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Goodwill, fair value [3]   7,976      
Goodwill, impairment loss [3]   254,946      
Definite lived intangible assets, fair value [4]   5,750      
Definite lived intangible assets, impairment loss [4]   83,339      
Fair Value, Measurements, Nonrecurring | Wireless Test          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Goodwill, carrying value   262,900      
Goodwill, fair value   8,000      
Goodwill, impairment loss   254,900      
Definite lived intangible assets, carrying value   89,200      
Definite lived intangible assets, fair value   5,800      
Definite lived intangible assets, impairment loss   $ 83,300      
[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] In accordance with the provisions of ASC 350-20, "Goodwill", goodwill in the Wireless Test reporting unit with a carrying amount of $262.9 million was written down in the second quarter of 2016 to its implied fair value of $8.0 million, resulting in an impairment charge of $254.9 million. See Note J: "Goodwill and Intangible Assets" regarding goodwill impairment.
[4] In accordance with the provisions of ASC 360-10, "Property, Plant and Equipment", definite lived intangible assets in the Wireless Test reporting unit with a carrying amount of $89.2 million were written down in the second quarter of 2016 to their implied fair value of $5.8 million, resulting in an impairment charge of $83.3 million. See Note J: "Goodwill and Intangible Assets" regarding definite lived intangible assets impairment.