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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Oct. 01, 2017 | [5] | Jul. 02, 2017 | [4],[6] | Apr. 02, 2017 | [7] | Dec. 31, 2016 | Oct. 02, 2016 | [2],[9] | Jul. 03, 2016 | Apr. 03, 2016 | [2],[10] | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 252,011 |  |  |  |  | $ 223,343 |  |  |  |  |  | $ 252,011 | $ 223,343 | $ 488,413
Goodwill impairment |  |  |  |  |  | 0 |  |  | $ 254,946 | [1],[2] |  | 0 | 254,946 |
Acquired intangible assets impairment |  |  |  |  |  |  |  |  | 83,339 | [1],[2] |  |  | 83,339 |
Intangible assets remaining balance | 79,088 |  |  |  |  | 100,401 |  |  |  |  |  | 79,088 | 100,401 |
Acquired intangible assets amortization | 7,384 | [3],[4] | $ 7,028 | $ 8,166 | $ 7,952 | 7,923 | [2],[8] | $ 8,487 | $ 16,244 | [1],[2] | $ 19,994 | 30,530 | 52,648 | 69,031
Wireless Test |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee reduction, percentage |  |  |  |  |  |  |  |  | 11.00% |  |  |  |  |
Goodwill | 7,976 |  |  |  |  | $ 7,976 |  |  | $ 8,000 |  |  | 7,976 | 7,976 | $ 262,922
Goodwill impairment |  |  |  |  |  |  |  |  | 254,900 |  |  |  | 254,946 |
Acquired intangible assets impairment |  |  |  |  |  |  |  |  | $ 83,300 |  |  |  | $ 83,339 |
Intangible assets remaining balance | $ 3,600 |  |  |  |  |  |  |  |  |  |  | $ 3,600 |  |
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 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] | Restructuring and other includes a $6.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, $1.8 million of employee severance charges, and $1.1 million of charges for impairment of fixed assets.
[4] | Teradyne recorded pension and post retirement net actuarial gains of $2.5 million and $3.8 million for the second and fourth quarter in 2017, respectively. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[5] | Restructuring and other includes $5.1 million of property insurance recovery related to the Japan earthquake, a $0.4 million credit related to previously impaired lease termination of a Wireless Test facility in Sunnyvale, CA, and a $0.3 million credit for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $0.8 million of Japan earthquake related expenses and $0.6 million of employee severance charges.
[6] | Restructuring and other includes a $1.5 million charge for a fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.8 million of employee severance charges.
[7] | Restructuring and other includes a $1.3 million charge for a lease impairment of a Wireless Test facility in Sunnyvale, CA, a $0.6 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.6 million of employee severance charges.
[8] | Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[9] | Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[10] | Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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