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Schedule of Segment Reporting Information by Segment Charges (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jul. 01, 2012 | Jun. 30, 2013 | Jul. 01, 2012
Semiconductor Test |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Cost of revenues-provision for excess and obsolete inventory | $ 287 | $ 5,957 | $ 500 | $ 6,169
Restructuring and other |  | 286 |  | 286
Total | 287 | 6,243 | 500 | 6,455
Wireless Test |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Cost of revenues-provision for excess and obsolete inventory | 1,398 | 1,643 | 4,066 | 2,116
Cost of revenues-inventory step-up |  | 1,218 |  | 6,089
Total | 1,398 | 2,861 | 4,066 | 8,205
Systems Test Group |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Cost of revenues-provision for excess and obsolete inventory | 290 | 1,753 | 1,209 | 2,642
Restructuring and other | 131 |  | 375 |
Total | 421 | 1,753 | 1,584 | 2,642
Corporate And Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring and other |  | (6,548) |  | (8,406)
Total |  | $ (6,548) |  | $ (8,406)

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

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

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

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- Details
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Period Type: | duration