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

X

- 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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- Details

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- Details

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- Details

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