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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2016
Property Plant and Equipment, Net | Property, plant and equipment, net consisted of the following at December 31, 2016 and 2015:
|  | 2016 |  |  | 2015 |
|  | (in thousands) |
Land |  | $ | 16,561 |  |  | $ | 16,561 |
Buildings |  |  | 98,031 |  |  |  | 108,797 |
Machinery and equipment |  |  | 601,835 |  |  |  | 595,445 |
Furniture and fixtures, and software |  |  | 82,897 |  |  |  | 82,612 |
Leasehold improvements |  |  | 46,612 |  |  |  | 43,328 |
Construction in progress |  |  | 3,032 |  |  |  | 2,630 |
|  |  | 848,968 |  |  |  | 849,373 |
Less: accumulated depreciation |  |  | 595,147 |  |  |  | 575,959 |
|  | $ | 253,821 |  |  | $ | 273,414 |

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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