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Consolidated Quarterly Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Oct. 04, 2015 | Jul. 05, 2015 | Dec. 31, 2014 | Sep. 28, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Changes to fair value of contingent consideration |  |  |  |  |  |  | $ 2,489 | $ (630) |
Pension and post retirement net actuarial losses (gain) | $ 17,732 |  |  | $ 46,564 |  |  | 17,732 | 46,564 | $ (10,340)
Goodwill impairment |  |  |  | $ 98,897 | [1],[2],[3] |  |  | 98,897 | $ 0
ZTEC Instruments, Inc. |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Changes to fair value of contingent consideration |  |  | $ (1,600) |  |  | $ (630) | (1,600) | $ (630) |
Universal Robots |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Changes to fair value of contingent consideration | 5,339 |  |  |  |  |  | 5,339 |  |
Avionics Interface Technologies, LLC |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |
Changes to fair value of contingent consideration | $ (300) | $ (1,000) |  |  |  |  | $ (1,250) |  |
[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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