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Assets Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Assets, impairment loss |  |  |  |  |
Goodwill, impairment loss | $ 98,897 | [1],[2],[3] |  | $ 98,897 | $ 0
Definite lived intangible assets, impairment loss |  |  | $ 98,200 |  |
Fair Value, Measurements, Nonrecurring |  |  |  |  |
Assets |  |  |  |  |
Goodwill, fair value | 273,438 |  |  | 273,438 |
Definite lived intangible assets, fair value | 158,237 |  |  | 158,237 |
Long-lived assets held and used, fair value | 10,189 |  |  | 10,189 |
Total | 441,864 |  |  | 441,864 |
Assets, impairment loss |  |  |  |  |
Goodwill, impairment loss |  |  |  | 98,897 |
Definite lived intangible assets, impairment loss |  |  |  | 0 |
Long-lived assets held and used, impairment loss |  |  |  | 0 |
Asset Impairment Charges, Total |  |  |  | 98,897 |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |  |  |  |
Assets |  |  |  |  |
Long-lived assets held and used, fair value | 10,189 |  |  | 10,189 |
Total | 10,189 |  |  | 10,189 |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Assets |  |  |  |  |
Goodwill, fair value | 273,438 |  |  | 273,438 |
Definite lived intangible assets, fair value | 158,237 |  |  | 158,237 |
Total | $ 431,675 |  |  | $ 431,675 |
[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.

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 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 + Details
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