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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2013
Property Plant and Equipment | Property, plant and equipment consist of the following:
|  | 2013 |  |  | 2012 |
|  | (in thousands) |
Land |  | $ | 16,561 |  |  | $ | 16,561 |
Buildings |  |  | 107,632 |  |  |  | 106,706 |
Machinery and equipment |  |  | 600,848 |  |  |  | 606,414 |
Furniture and fixtures, and software |  |  | 81,994 |  |  |  | 93,683 |
Leasehold improvements |  |  | 30,757 |  |  |  | 29,585 |
Construction in progress |  |  | 622 |  |  |  | 3,425 |
|  |  | 838,414 |  |  |  | 856,374 |
Less: accumulated depreciation and amortization |  |  | 563,178 |  |  |  | 590,592 |
|  | $ | 275,236 |  |  | $ | 265,782 |

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- Definition Schedule of Property, Plant and Equipment [Table Text Block] + References No definition available. + Details
Name: | ter_ScheduleOfPropertyPlantAndEquipmentTableTextBlock
Namespace Prefix: | ter_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration