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Property Plant and Equipment - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |
Depreciation of property, plant and equipment | $ 73,390,000 us-gaap_Depreciation | $ 57,317,000 us-gaap_Depreciation | $ 55,049,000 us-gaap_Depreciation
Machinery and equipment | 659,743,000 us-gaap_MachineryAndEquipmentGross | 600,848,000 us-gaap_MachineryAndEquipmentGross |
Accumulated depreciation | 567,992,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | 563,178,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |
Minimum non-cancelable future lease payments for year 2015 | 13,521,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |
Test Systems Leased By Customers |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Machinery and equipment | 66,900,000 us-gaap_MachineryAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ter_TestSystemsLeasedByCustomersMember |  |
Accumulated depreciation | 10,100,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ter_TestSystemsLeasedByCustomersMember |  |
Minimum non-cancelable future lease payments for year 2015 | 13,900,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ter_TestSystemsLeasedByCustomersMember |  |
Minimum non-cancelable future lease payments beyond 2015 | $ 0 ter_OperatingLeasesFutureMinimumPaymentsDueYearOneThereafter / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ter_TestSystemsLeasedByCustomersMember |  |

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- Definition Operating Leases, Future Minimum Payments, Due Year One Thereafter + References No definition available. + Details
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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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