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Schedule of Segment Reporting Information by Segment Charges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 05, 2015	Mar. 30, 2014
Segment Reporting Information [Line Items]
Other (income) expense, net - gain from the sale of an equity investment	$ 4,782us-gaap_GainLossOnSaleOfEquityInvestments
Selling and administrative - stock based compensation charge		6,600us-gaap_AllocatedShareBasedCompensationExpense
Semiconductor Test
Segment Reporting Information [Line Items]
Cost of revenues - inventory charge	531ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember	6,205ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_SemiconductorTestMember
Wireless Test
Segment Reporting Information [Line Items]
Cost of revenues - inventory charge	846ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember	3,093ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_WirelessTestMember
System Test
Segment Reporting Information [Line Items]
Cost of revenues - inventory charge	63ter_CostOfRevenuesProvisionForExcessAndObsoleteInventory / us-gaap_StatementBusinessSegmentsAxis = ter_SystemsTestGroupMember	741ter_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		$ 6,598us-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.

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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

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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

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