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Consolidated Quarterly Statements of Operations (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 28, 2014 | Jun. 29, 2014 | Mar. 30, 2014 | Dec. 31, 2013 | Sep. 29, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Changes to fair value of contingent consideration |  |  | $ (630)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 |  |  |  |  |  |  |  |  |  | $ (630)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 |  | $ (8,761)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Pension and post retirement net actuarial losses (gain) |  |  |  |  |  |  |  |  |  |  |  |  | 46,564 us-gaap_DefinedBenefitPlanActuarialGainLoss | (10,340)us-gaap_DefinedBenefitPlanActuarialGainLoss | 23,320 us-gaap_DefinedBenefitPlanActuarialGainLoss
Goodwill impairment | 98,897 us-gaap_GoodwillImpairmentLoss | [1],[2],[3] |  |  |  |  |  |  |  |  |  |  | 98,897 us-gaap_GoodwillImpairmentLoss |  |
Other (income) expense, net | (463)us-gaap_OtherNonoperatingIncomeExpense | [1],[2],[3] | 654 us-gaap_OtherNonoperatingIncomeExpense | [1],[4] | (382)us-gaap_OtherNonoperatingIncomeExpense | [1] | (180)us-gaap_OtherNonoperatingIncomeExpense | 34,168 us-gaap_OtherNonoperatingIncomeExpense | [5],[6] | (414)us-gaap_OtherNonoperatingIncomeExpense | (19)us-gaap_OtherNonoperatingIncomeExpense | (503)us-gaap_OtherNonoperatingIncomeExpense | (372)us-gaap_OtherNonoperatingIncomeExpense | 33,231 us-gaap_OtherNonoperatingIncomeExpense | (948)us-gaap_OtherNonoperatingIncomeExpense
Defined Benefit Pension And Post Retirement Benefit Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and post retirement net actuarial losses (gain) | $ 46,600 us-gaap_DefinedBenefitPlanActuarialGainLoss / ter_DefinedBenefitPensionPlanAxis = ter_DefinedBenefitPensionAndPostRetirementBenefitPlansMember |  |  |  |  |  |  | $ (9,000)us-gaap_DefinedBenefitPlanActuarialGainLoss / ter_DefinedBenefitPensionPlanAxis = ter_DefinedBenefitPensionAndPostRetirementBenefitPlansMember |  |  |  |  |  |  |
[1] | Dividends declared by Teradyne's Board of Directors were paid in each of the second, third and fourth quarters of 2014.
[2] | 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.
[3] | In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[4] | Restructuring and other includes a $(0.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[5] | Other (income) expense, net includes a $34.2 million gain from the sale of an equity investment.
[6] | In the fourth quarter ended December 31, 2013, Teradyne recorded pension and post retirement net actuarial gains of $9.0 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.

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