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Schedule of Provision Benefit for Income Taxes from Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current, U.S. Federal |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,197 us-gaap_CurrentFederalTaxExpenseBenefit | $ 18,051 us-gaap_CurrentFederalTaxExpenseBenefit | $ 22,695 us-gaap_CurrentFederalTaxExpenseBenefit
Current, Non-U.S. |  |  |  |  |  |  |  |  |  |  |  |  | 28,157 us-gaap_CurrentForeignTaxExpenseBenefit | 22,509 us-gaap_CurrentForeignTaxExpenseBenefit | 18,261 us-gaap_CurrentForeignTaxExpenseBenefit
Current, State |  |  |  |  |  |  |  |  |  |  |  |  | 678 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | (269)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | (12)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current, Total |  |  |  |  |  |  |  |  |  |  |  |  | 34,032 us-gaap_CurrentIncomeTaxExpenseBenefit | 40,291 us-gaap_CurrentIncomeTaxExpenseBenefit | 40,944 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred, U.S. Federal |  |  |  |  |  |  |  |  |  |  |  |  | (20,449)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (1,692)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 8,158 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred, Non-U.S. |  |  |  |  |  |  |  |  |  |  |  |  | (404)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (1,386)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | 5,997 us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred, State |  |  |  |  |  |  |  |  |  |  |  |  | 925 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (238)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (6,172)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred, Total |  |  |  |  |  |  |  |  |  |  |  |  | (19,928)ter_DeferredIncomeTaxExpenseBenefitNetOfAdjustments | (3,316)ter_DeferredIncomeTaxExpenseBenefitNetOfAdjustments | 7,983 ter_DeferredIncomeTaxExpenseBenefitNetOfAdjustments
Total provision for income taxes: | $ (21,002)us-gaap_IncomeTaxExpenseBenefit | [1],[2],[3] | $ 17,721 us-gaap_IncomeTaxExpenseBenefit | [1],[4] | $ 20,187 us-gaap_IncomeTaxExpenseBenefit | [1] | $ (2,802)us-gaap_IncomeTaxExpenseBenefit | $ 13,096 us-gaap_IncomeTaxExpenseBenefit | [5],[6] | $ 18,093 us-gaap_IncomeTaxExpenseBenefit | $ 13,801 us-gaap_IncomeTaxExpenseBenefit | $ (8,015)us-gaap_IncomeTaxExpenseBenefit | $ 14,104 us-gaap_IncomeTaxExpenseBenefit | $ 36,975 us-gaap_IncomeTaxExpenseBenefit | $ 48,927 us-gaap_IncomeTaxExpenseBenefit
[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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