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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 11, 2015 | Oct. 31, 2014 | Dec. 31, 2015 | [4],[5] | Oct. 04, 2015 | [6] | Jul. 05, 2015 | [7] | Apr. 05, 2015 | Dec. 31, 2014 | Sep. 28, 2014 | [1],[8] | Jun. 29, 2014 | [1] | Mar. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  | $ 98,897 | [1],[2],[3] |  |  |  |  | $ 98,897 | $ 0
Fully amortized intangible assets wrote off |  |  |  |  |  |  |  |  |  |  |  | $ 98,200 |  |
Acquired intangible assets amortization |  |  | $ 19,911 | $ 20,053 | $ 15,258 | $ 13,808 | 15,957 | [1],[2],[3] | $ 18,271 | $ 18,271 | $ 18,271 | 69,031 | 70,771 | $ 72,447
Avionics Interface Technologies, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  | $ 9,080 |  |  |  |  |  |  |  |  |  |  | $ 9,080 |
Universal Robots |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 121,590 |  |  |  |  |  |  |  |  |  |  | $ 121,590 |  |
System Test |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
[1] | Dividends declared by Teradyne's Board of Directors were paid in the second, third and fourth quarters of 2014.
[2] | In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[3] | In the fourth quarter ended December 31, 2014, Teradyne recorded pension and post retirement net actuarial losses of $46.6 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[4] | 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 our accounting policy.
[5] | 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.
[6] | Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[7] | Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[8] | Restructuring and other includes a $(0.6) 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=56944662&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=26713463&loc=d3e16323-109275 + Details
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