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Stock Based Compensation - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended
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Jan. 31, 2014 Age | Apr. 05, 2015 | Mar. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Number of service-based stock options granted to executive officers |  | 0.1 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 0.1 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Weighted average grant date fair value of stock options granted to executive officers |  | $ 4.43 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 5.49 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Stock options term |  | 7 years |
Stock based compensation expense related to retirement agreement |  |  | $ 6,600,000 us-gaap_AllocatedShareBasedCompensationExpense
TSR Performance-Based Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Total shareholder return performance measurement period | 3 years |  |
Minimum age of retirement to be eligible for PRSUs | 60 ter_MinimumRetirementAgeForEligibleEmployeesOfPostretirementPlans / us-gaap_AwardTypeAxis = ter_ShareholderReturnPerformanceBasedRestrictedStockUnitsMember |  |
Minimum years of service for retirement to be eligible for PRSUs | 10 years |  |
Restricted stock unit awards granted |  | 0.2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = ter_ShareholderReturnPerformanceBasedRestrictedStockUnitsMember | 0.1 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = ter_ShareholderReturnPerformanceBasedRestrictedStockUnitsMember
Weighted average grant date fair value of restricted stock units granted |  | $ 18.21 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ter_ShareholderReturnPerformanceBasedRestrictedStockUnitsMember | $ 22.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ter_ShareholderReturnPerformanceBasedRestrictedStockUnitsMember
Estimated annual dividend amount per share |  | $ 0.24 us-gaap_FairValueAssumptionsExpectedDividendPayments / us-gaap_AwardTypeAxis = ter_ShareholderReturnPerformanceBasedRestrictedStockUnitsMember |
Stock price |  | $ 18.10 us-gaap_SharePrice / us-gaap_AwardTypeAxis = ter_ShareholderReturnPerformanceBasedRestrictedStockUnitsMember | $ 19.16 us-gaap_SharePrice / us-gaap_AwardTypeAxis = ter_ShareholderReturnPerformanceBasedRestrictedStockUnitsMember
TSR Performance-Based Restricted Stock Units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Percentage of vesting of target shares upon performance achieved | 200.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = ter_ShareholderReturnPerformanceBasedRestrictedStockUnitsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
TSR Performance-Based Restricted Stock Units | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Percentage of vesting of target shares upon performance achieved | 0.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = ter_ShareholderReturnPerformanceBasedRestrictedStockUnitsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Service-Based Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Restricted stock unit awards granted |  | 1.4 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = ter_ServiceBasedRestrictedStockUnitsMember | 1.6 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = ter_ServiceBasedRestrictedStockUnitsMember
Weighted average grant date fair value of restricted stock units granted |  | $ 17.14 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ter_ServiceBasedRestrictedStockUnitsMember | $ 18.19 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ter_ServiceBasedRestrictedStockUnitsMember
Restricted Stock Units | Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Period of stock granted to employees and executive officers vest in equal installments |  | 4 years |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock price |  | $ 18.10 us-gaap_SharePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 19.16 us-gaap_SharePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Period of stock granted to employees and executive officers vest in equal installments |  | 4 years |
Estimated annual dividend amount per share |  | $ 0.24 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |

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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 Amount of dividends expected to be paid to holders of the underlying shares or contracted instruments over the term of the instruments life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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