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v2.4.1.9

Restructuring and Other - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2014 | Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2013 Employee
Restructuring Cost and Reserve |  |  |  |
Severance benefit and charges |  | $ 400,000 us-gaap_SeveranceCosts1 |  |
Business acquisition, contingent consideration | (630,000)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | (630,000)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | (8,761,000)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 |
Acquisition cost related to AIT |  | 400,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |
Wireless Test |  |  |  |
Restructuring Cost and Reserve |  |  |  |
Severance benefit and charges |  | 500,000 us-gaap_SeveranceCosts1 / us-gaap_ProductOrServiceAxis = ter_WirelessTestMember |  |
Reduction in employees head count |  | 28 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_ProductOrServiceAxis = ter_WirelessTestMember |  |
System Test and Semiconductor Test |  |  |  |
Restructuring Cost and Reserve |  |  |  |
Severance benefit and charges |  | 500,000 us-gaap_SeveranceCosts1 / us-gaap_ProductOrServiceAxis = ter_SemiconductorTestAndSystemTestGroupMember | 1,000,000 us-gaap_SeveranceCosts1 / us-gaap_ProductOrServiceAxis = ter_SemiconductorTestAndSystemTestGroupMember | 1,900,000 us-gaap_SeveranceCosts1 / us-gaap_ProductOrServiceAxis = ter_SemiconductorTestAndSystemTestGroupMember
Reduction in employees head count |  | 8 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_ProductOrServiceAxis = ter_SemiconductorTestAndSystemTestGroupMember | 19 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_ProductOrServiceAxis = ter_SemiconductorTestAndSystemTestGroupMember | 48 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_ProductOrServiceAxis = ter_SemiconductorTestAndSystemTestGroupMember
System Test |  |  |  |
Restructuring Cost and Reserve |  |  |  |
Severance benefit and charges |  | 400,000 us-gaap_SeveranceCosts1 / us-gaap_ProductOrServiceAxis = ter_SystemsTestGroupMember |  |
Reduction in employees head count |  | 4 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_ProductOrServiceAxis = ter_SystemsTestGroupMember |  |
Corporate And Eliminations |  |  |  |
Restructuring Cost and Reserve |  |  |  |
Severance benefit and charges |  | 200,000 us-gaap_SeveranceCosts1 / us-gaap_ProductOrServiceAxis = ter_CorporateAndEliminationsMember |  |
Reduction in employees head count |  | 3 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_ProductOrServiceAxis = ter_CorporateAndEliminationsMember |  |
Change in estimated exit costs related to leased facility |  |  |  | $ (400,000)us-gaap_BusinessExitCosts1 / us-gaap_ProductOrServiceAxis = ter_CorporateAndEliminationsMember

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition The number of positions eliminated during the period as a result of restructuring activities. + References No definition available. + Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Details
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