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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Oct. 02, 2016 | [2],[4] | Jul. 03, 2016 | Apr. 03, 2016 | [2],[5] | Dec. 31, 2015 | Oct. 04, 2015 | [8] | Jul. 05, 2015 | [9] | Apr. 05, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge | $ 0 |  |  | $ 254,946 | [1],[2] |  |  |  |  |  |  | $ 98,897 | $ 254,946 | $ (254,946) | $ 98,897
Intangible assets impairment |  |  |  | 83,339 | [1],[2] |  |  |  |  |  |  |  | 83,339 | 98,200 |
Intangible assets remaining balance | 100,401 |  |  |  |  |  | $ 239,831 |  |  |  |  |  | 100,401 | 239,831 |
Acquired intangible assets amortization | $ 7,923 | [2],[3] | $ 8,487 | $ 16,244 | [1],[2] | $ 19,994 | $ 19,911 | [6],[7] | $ 20,053 | $ 15,258 | $ 13,808 |  | 52,648 | 69,031 | 70,771
System Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
Wireless Test |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee reduction, percentage |  |  |  | 11.00% |  |  |  |  |  |  |  |  |  |  |
Goodwill, fair value |  |  |  | $ 8,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  | 254,946 |  |  |  |  |  |  |  |  | 254,946 | $ (254,946) | $ 98,897
Intangible assets impairment |  |  |  |  |  |  |  |  |  |  |  |  | $ 83,339 |  |
Intangible assets remaining balance |  |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |
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 $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] | Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[4] | Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[5] | Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[6] | In the fourth quarter ended December 31, 2015, Teradyne recorded pension and post retirement net actuarial losses of $17.7 million. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[7] | Restructuring and other includes a $5.3 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and a $(0.3) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[8] | Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[9] | Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC 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=66902209&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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- Definition Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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