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Retirement Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Apr. 05, 2015
U.S. Supplemental Executive Defined Benefit Pension Plan |
Defined Benefit Plan Disclosure |
Contribution to defined benefit pension plans | $ 0.6 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedContributionPlanTypeAxis = ter_UnitedStatesSupplementalExecutiveDefinedBenefitPensionPlanMember
Foreign Pension Plans, Defined Benefit |
Defined Benefit Plan Disclosure |
Contribution to defined benefit pension plans | $ 0.2 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedContributionPlanTypeAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DefinedContributionPlanTypeAxis=us-gaap_ForeignPensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |