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Schedule of Segment Reporting Information by Segment Charges and Credit (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 02, 2017 | Jul. 03, 2016 | Jul. 02, 2017 | Jul. 03, 2016
System Test |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Cost of revenues-inventory charge | $ 473 | $ 237 | $ 1,358 | $ 320

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- Definition Cost of revenues-provision for excess and obsolete inventory. + References No definition available. + Details
Name: | ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory
Namespace Prefix: | ter_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ter_SystemsTestGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |