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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2017
Property Plant and Equipment, Net | Property, plant and equipment, net consisted of the following at December 31, 2017 and 2016:
|  | 2017 |  |  | 2016 |
|  | (in thousands) |
Land |  | $ | 16,561 |  |  | $ | 16,561 |
Buildings |  |  | 98,369 |  |  |  | 98,031 |
Machinery and equipment |  |  | 647,961 |  |  |  | 601,835 |
Furniture and fixtures, and software |  |  | 88,539 |  |  |  | 82,897 |
Leasehold improvements |  |  | 49,540 |  |  |  | 46,612 |
Construction in progress |  |  | 13,522 |  |  |  | 3,032 |
|  |  | 914,492 |  |  |  | 848,968 |
Less: accumulated depreciation |  |  | 646,045 |  |  |  | 595,147 |
|  | $ | 268,447 |  |  | $ | 253,821 |

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- Definition Schedule of property, plant and equipment. + References No definition available. + Details
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Namespace Prefix: | ter_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration