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Schedule of Segment Reporting Information by Segment Charges (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |
Restructuring and other, net |  |  | $ 5,800 |  |  |
Semiconductor Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Cost of revenues-inventory charge | 18,433 | [1] | 10,370 | [1] | 4,521 | [1]
Restructuring and other, net | 386 |  | 2,142 |  | 1,437 |
Systems Test Group |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Cost of revenues-inventory charge | 4,271 |  | 1,090 |  | 1,450 |
Restructuring and other, net | 451 |  | (300) |  | (2,133) |
Wireless Test |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Cost of revenues-inventory step-up | 6,089 | [2] | 12,178 | [2] |  |
Cost of revenues-inventory charge | 4,145 |  | 141 |  |  |
Restructuring and other, net | 236 |  |  |  |  |
Corporate And Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Restructuring and other, net | $ (8,794) |  | $ 4,901 |  | $ (3,104) |
[1] | Included in the cost of revenues for the years ended December 31, 2012 and 2011 are charges for excess inventory provisions recorded primarily as a result of product transition.
[2] | Included in the cost of revenues for the years ended December 31, 2012 and 2011 is the cost for purchase accounting inventory step-up.

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- Definition Cost of Revenues-Inventory Step-Up + References No definition available. + Details
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Balance Type: | debit
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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
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- Definition Restructuring And Other Charges + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Restructuring and other, net. + References No definition available. + Details
Name: | ter_RestructuringAndOtherNet
Namespace Prefix: | ter_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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