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Stock Based Compensation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 40,307us-gaap_ShareBasedCompensation	$ 36,612us-gaap_ShareBasedCompensation	$ 39,920us-gaap_ShareBasedCompensation
Income tax benefit	(535)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	(2,675)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	(8,490)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Total stock-based compensation expense after income taxes	28,771ter_TotalStockBasedCompensationExpensesAfterIncomeTaxes	26,850ter_TotalStockBasedCompensationExpensesAfterIncomeTaxes	30,372ter_TotalStockBasedCompensationExpensesAfterIncomeTaxes
Cost Of Revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	3,675us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_CostOfRevenuesMember	4,338us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_CostOfRevenuesMember	6,604us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_CostOfRevenuesMember
Engineering And Development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	10,146us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_EngineeringAndDevelopmentMember	12,452us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_EngineeringAndDevelopmentMember	13,589us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_EngineeringAndDevelopmentMember
Selling And Administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	26,486us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_SellingAndAdministrativeMember	19,822us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_SellingAndAdministrativeMember	19,727us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_SellingAndAdministrativeMember
Stock Based Compensation
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Income tax benefit	$ (11,537)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_IncomeStatementLocationAxis = ter_StockBasedCompensationMember	$ (9,762)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_IncomeStatementLocationAxis = ter_StockBasedCompensationMember	$ (9,548)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_IncomeStatementLocationAxis = ter_StockBasedCompensationMember

X

- Definition

Total stock based compensation expenses after income taxes.

+ References

No definition available.

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- Definition

Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ 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 (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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