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Non-Financial Assets Measured At Fair Value On Non-Recurring Basis (Parenthetical) (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, carrying value |  | $ 985,909 |  |  |  | $ 781,058 |  | $ 985,909 |  | $ 996,033 | $ 781,058
Goodwill, impairment loss |  | 0 |  | $ 254,946 | [1],[2] | 98,897 |  | 254,946 |  | (254,946) | 98,897
Definite lived intangible assets, carrying value |  | 414,208 | [3] |  |  |  |  | 414,208 | [3] | 546,388 |
Definite lived intangible assets, impairment loss |  |  |  | 83,339 | [1],[2] |  |  | 83,339 |  | 98,200 |
Wireless Test |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |  |  |  |  |
Goodwill, carrying value |  | $ 361,819 |  |  |  | $ 361,819 |  | 361,819 |  | 361,819 | 361,819
Goodwill, fair value |  |  |  | 8,000 |  |  | $ 8,000 |  |  |  |
Goodwill, impairment loss |  |  |  | 254,946 |  |  |  | 254,946 |  | $ (254,946) | $ 98,897
Definite lived intangible assets, impairment loss |  |  |  |  |  |  |  | $ 83,339 |  |  |
Fair Value, Measurements, Nonrecurring |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |  |  |  |  |
Goodwill, fair value | [4] |  |  | 7,976 |  |  | 7,976 |  |  |  |
Goodwill, impairment loss | [4] |  |  |  |  |  | 254,946 |  |  |  |
Definite lived intangible assets, fair value | [5] |  |  | 5,750 |  |  | 5,750 |  |  |  |
Definite lived intangible assets, impairment loss | [5] |  |  |  |  |  | 83,339 |  |  |  |
Fair Value, Measurements, Nonrecurring | Wireless Test |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |  |  |  |  |  |  |  |
Goodwill, carrying value |  |  |  | 262,900 |  |  | 262,900 |  |  |  |
Goodwill, fair value |  |  |  | 8,000 |  |  | 8,000 |  |  |  |
Goodwill, impairment loss |  |  |  | 254,946 |  |  |  |  |  |  |
Definite lived intangible assets, carrying value |  |  |  | 89,200 |  |  | 89,200 |  |  |  |
Definite lived intangible assets, fair value |  |  |  | 5,800 |  |  | $ 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 $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] | During the year ended December 31, 2016, Teradyne recorded an $83.3 million impairment of Wireless Test amortizable intangible assets. The impairment assets have been eliminated from the gross carrying amount and accumulated amortization.
[4] | 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.
[5] | 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.

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