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Schedule of Segment Reporting Information by Segment Charges (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Apr. 01, 2012
Semiconductor Test |  |
Segment Reporting Information [Line Items] |  |
Cost of revenues-provision for excess and obsolete inventory | $ 213 | $ 212
Total | 213 | 212
Wireless Test |  |
Segment Reporting Information [Line Items] |  |
Cost of revenues-inventory step-up |  | 4,871
Cost of revenues-provision for excess and obsolete inventory | 2,668 | 473
Total | 2,668 | 5,344
Systems Test Group |  |
Segment Reporting Information [Line Items] |  |
Cost of revenues-provision for excess and obsolete inventory | 919 | 889
Restructuring and other | 244 |
Total | 1,163 | 889
Corporate And Eliminations |  |
Segment Reporting Information [Line Items] |  |
Restructuring and other |  | (1,825)
Total |  | $ (1,825)

X
- Definition Cost of Revenues-Inventory Step-Up + References No definition available. + Details
Name: | ter_CostOfRevenuesInventoryStepUp
Namespace Prefix: | ter_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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 Restructuring And Other Charges + References No definition available. + Details
Name: | ter_RestructuringAndOtherCharges
Namespace Prefix: | ter_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Segment reporting information segment charges. + References No definition available. + Details
Name: | ter_SegmentReportingInformationSegmentCharges
Namespace Prefix: | ter_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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