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Schedule of Segment Reporting Information by Segment Charges (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Apr. 05, 2015 | Mar. 30, 2014
Segment Reporting Information [Line Items] |  |  |
Other (income) expense, net - gain from the sale of an equity investment | $ 4,782 us-gaap_GainLossOnSaleOfEquityInvestments |  |
Selling and administrative - stock based compensation charge |  | 6,600 us-gaap_AllocatedShareBasedCompensationExpense |
Semiconductor Test |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of revenues - inventory charge | 531 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember | 6,205 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember |
Wireless Test |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of revenues - inventory charge | 846 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember | 3,093 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember |
System Test |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of revenues - inventory charge | 63 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember | 741 ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember |
Corporate And Eliminations | Other (income) expense, net |  |  |
Segment Reporting Information [Line Items] |  |  |
Other (income) expense, net - gain from the sale of an equity investment | (4,782)us-gaap_GainLossOnSaleOfEquityInvestments / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherNonoperatingIncomeExpenseMember / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember |  |
Corporate And Eliminations | Selling, General and Administrative Expenses |  |  |
Segment Reporting Information [Line Items] |  |  |
Selling and administrative - stock based compensation charge |  | $ 6,598 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_StatementBusinessSegmentsAxis = ter_CorporateAndEliminationsMember | [1]
[1] | See Note J: "Stock-Based Compensation" regarding the stock-based compensation charge.

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- Definition Cost of revenues-provision for excess and obsolete inventory. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence. + 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 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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Period Type: |

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- Details
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- Details
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Period Type: |