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Non-Financial Assets Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Jul. 03, 2016
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis        
Goodwill, impairment loss $ 0 $ 254,946 [1],[2] $ 0 $ 254,946
Definite lived intangible assets, impairment loss   83,339 [1],[2]   $ 83,339
Fair Value, Measurements, Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis        
Goodwill, fair value [3]   7,976    
Definite lived intangible assets, fair value [4]   5,750    
Total   13,726    
Goodwill, impairment loss [3]   254,946    
Definite lived intangible assets, impairment loss [4]   83,339    
Asset Impairment Charges, Total   338,285    
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis        
Goodwill, fair value [3]   7,976    
Definite lived intangible assets, fair value [4]   5,750    
Total   $ 13,726    
[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.