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Stock Based Compensation (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | $ 40,307 us-gaap_ShareBasedCompensation | $ 36,612 us-gaap_ShareBasedCompensation | $ 39,920 us-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 | 28,771 ter_TotalStockBasedCompensationExpensesAfterIncomeTaxes | 26,850 ter_TotalStockBasedCompensationExpensesAfterIncomeTaxes | 30,372 ter_TotalStockBasedCompensationExpensesAfterIncomeTaxes
Cost Of Revenues |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | 3,675 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_CostOfRevenuesMember | 4,338 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_CostOfRevenuesMember | 6,604 us-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 | 10,146 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_EngineeringAndDevelopmentMember | 12,452 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_EngineeringAndDevelopmentMember | 13,589 us-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 | 26,486 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_SellingAndAdministrativeMember | 19,822 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = ter_SellingAndAdministrativeMember | 19,727 us-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

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- Definition Total stock based compensation expenses after income taxes. + References No definition available. + Details
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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 + Details
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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 + Details
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