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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
Property Plant and Equipment, Net | Property, plant and equipment, net consisted of the following at December 31, 2018 and 2017:
|  | 2018 |  |  | 2017 |
|  | (in thousands) |
Land |  | $ | 16,561 |  |  | $ | 16,561 |
Buildings |  |  | 105,935 |  |  |  | 98,369 |
Machinery and equipment |  |  | 689,770 |  |  |  | 647,961 |
Furniture and fixtures, and software |  |  | 90,384 |  |  |  | 88,539 |
Leasehold improvements |  |  | 52,536 |  |  |  | 49,540 |
Construction in progress |  |  | 6,276 |  |  |  | 13,522 |
|  |  | 961,462 |  |  |  | 914,492 |
Less: accumulated depreciation |  |  | 681,641 |  |  |  | 646,045 |
|  | $ | 279,821 |  |  | $ | 268,447 |

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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