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Deferred Revenue and Customer Advances (Tables) | 3 Months Ended
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Mar. 31, 2013
Deferred Revenue and Customer Advances | Deferred revenue and customer advances consist of the following and are included in short- and long-term deferred revenue and customer advances.
|  | March 31, 2013 |  |  | December 31, 2012 |
|  | (in thousands) |
Customer advances |  | $ | 29,951 |  |  | $ | 39,613 |
Maintenance, training and extended warranty |  |  | 50,021 |  |  |  | 51,198 |
Undelivered elements |  |  | 7,466 |  |  |  | 6,773 |
Total deferred revenue and customer advances |  | $ | 87,438 |  |  | $ | 97,584 |

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- Definition Schedule of deferred revenue and customer advances [Table Text Block]. + References No definition available. + Details
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Namespace Prefix: | ter_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration