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v2.4.0.6

Useful Lives of Assets (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2012
Buildings |
Property, Plant and Equipment [Line Items] |
Useful lives, maximum years | 40 years
Building Improvements | Minimum |
Property, Plant and Equipment [Line Items] |
Useful lives, maximum years | 5 years
Building Improvements | Maximum |
Property, Plant and Equipment [Line Items] |
Useful lives, maximum years | 10 years
Leasehold Improvements |
Property, Plant and Equipment [Line Items] |
Useful lives, description | Lesser of lease term or useful life
Furniture and Fixtures |
Property, Plant and Equipment [Line Items] |
Useful lives, maximum years | 10 years
Test Systems Manufactured Internally |
Property, Plant and Equipment [Line Items] |
Useful lives, maximum years | 6 years
Machinery and Equipment | Minimum |
Property, Plant and Equipment [Line Items] |
Useful lives, maximum years | 3 years
Machinery and Equipment | Maximum |
Property, Plant and Equipment [Line Items] |
Useful lives, maximum years | 5 years
Software | Minimum |
Property, Plant and Equipment [Line Items] |
Useful lives, maximum years | 3 years
Software | Maximum |
Property, Plant and Equipment [Line Items] |
Useful lives, maximum years | 5 years

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- Definition Property plant and equipment useful life description. + References No definition available. + Details
Name: | ter_PropertyPlantAndEquipmentUsefulLifeDescription
Namespace Prefix: | ter_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration