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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | [2],[3] | Jul. 01, 2018 | [2],[4] | Apr. 01, 2018 | [5] | Dec. 31, 2017 | Oct. 01, 2017 | [7],[8] | Jul. 02, 2017 | [7],[9] | Apr. 02, 2017 | [10] | Jul. 03, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 381,850 |  |  |  |  | $ 252,011 |  |  |  |  |  | $ 381,850 | $ 252,011 | $ 223,343
Goodwill impairment |  |  |  |  |  |  |  |  |  |  |  |  |  | 254,946
Acquired intangible assets impairment |  |  |  |  |  |  |  |  |  |  |  | 8,800 |  | 83,339
Intangible assets remaining balance | 125,482 |  |  |  |  | 79,088 |  |  |  |  |  | 125,482 | 79,088 |
Acquired intangible assets amortization | 10,558 | [1],[2] | $ 11,142 | $ 9,793 | $ 7,698 | 7,384 | [6],[7] | $ 7,028 | $ 8,166 | $ 7,952 |  | 39,191 | 30,530 | 52,648
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 | 7,976
Goodwill impairment |  |  |  |  |  |  |  |  |  |  | 254,900 |  |  | 254,946
Acquired intangible assets impairment |  |  |  |  |  |  |  |  |  |  | $ 83,300 |  |  | $ 83,339
Intangible assets remaining balance | $ 2,200 |  |  |  |  |  |  |  |  |  |  | $ 2,200 |  |
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 a $17.7 million fair value adjustment to increase the MiR acquisition contingent consideration, $0.8 million of employee severance charges, and $0.5 million acquisition related expenses and compensation, partially offset by a $7.4 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability.
[2] | Teradyne recorded pension and post retirement net actuarial (gains) losses of $(0.1) million, $0.3 million and $(3.5) million for the second, third and fourth quarter in 2018, respectively. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[3] | Restructuring and other includes $1.7 million of employee severance charges, $0.8 million of acquisition related expenses and compensation, partially offset by a $0.8 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability.
[4] | Restructuring and other includes a $5.0 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $3.9 million of employee severance charges and $0.8 million of acquisition related expenses and compensation.
[5] | Restructuring and other includes a $3.5 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $2.5 million of acquisition related expenses and compensation and $2.4 million of employee severance charges.
[6] | 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.
[7] | Teradyne recorded pension and post retirement net actuarial gains of $2.8 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.
[8] | 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.
[9] | 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.
[10] | 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.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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