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Non-Financial Assets Measured At Fair Value On Non-Recurring Basis (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
Jul. 03, 2016
Dec. 31, 2014
Jul. 03, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis              
Goodwill, impairment loss $ 0 $ 254,946 [1],[2] $ 98,897   $ 254,946 $ (254,946) $ 98,897
Definite lived intangible assets, impairment loss   83,339 [1],[2]     $ 83,339 $ 98,200  
Fair Value, Measurements, Nonrecurring              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis              
Goodwill, fair value [3]   7,976   $ 7,976      
Definite lived intangible assets, fair value [4]   5,750   5,750      
Total   13,726   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   7,976      
Definite lived intangible assets, fair value [4]   5,750   5,750      
Total   $ 13,726   $ 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 $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] 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.