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Savings Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Savings Plan [Line Items] |  |  |
Savings plan maximum percentage of employees contribution allowable | 20.00%ter_SavingsPlanMaximumPercentageOfEmployeesContributionAllowable |  |
Percentage of employer contributions vested per year | 25.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage |  |
Maximum employment period considered for vesting of employers' contribution, in years | 4 ter_MaximumEmploymentPeriodConsideredForVestingOfEmployersContribution |  |
U.S. Qualified Pension Plan |  |  |
Savings Plan [Line Items] |  |  |
Maximum percentage of matching contributions made by the employer | 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ter_USQualifiedPensionPlanMember | 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ter_USQualifiedPensionPlanMember | 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ter_USQualifiedPensionPlanMember
Percentage of employer match on employee contribution | 4.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ter_USQualifiedPensionPlanMember | 4.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ter_USQualifiedPensionPlanMember | 4.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ter_USQualifiedPensionPlanMember
Savings Plan |  |  |
Savings Plan [Line Items] |  |  |
Amounts charged to statement of operations | 12.8 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ter_SavingsPlanMember | 12.0 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ter_SavingsPlanMember | 10.6 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ter_SavingsPlanMember

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- Definition Maximum employment period considered for vesting of employers' contribution + References No definition available. + Details
Name: | ter_MaximumEmploymentPeriodConsideredForVestingOfEmployersContribution
Namespace Prefix: | ter_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ter_SavingsPlanLineItems
Namespace Prefix: | ter_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Savings plan maximum percentage of employees contribution allowable + References No definition available. + Details
Name: | ter_SavingsPlanMaximumPercentageOfEmployeesContributionAllowable
Namespace Prefix: | ter_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=ter_SavingsPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=ter_USQualifiedPensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |