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Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items] |  |  |
Depreciation over life to cost of revenues and selling and administrative expenses, years | 6 years |  |
Net book value of internally manufactured test systems sold | $ 9.7 ter_BookValueOfInternallyManufacturedTestSystemsSold | $ 9.0 ter_BookValueOfInternallyManufacturedTestSystemsSold | $ 6.0 ter_BookValueOfInternallyManufacturedTestSystemsSold
Advertising costs | 1.9 us-gaap_AdvertisingExpense | 1.7 us-gaap_AdvertisingExpense | 1.6 us-gaap_AdvertisingExpense
Gains and losses on foreign exchange contracts | $ 0.9 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | $ 6.9 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | $ 4.5 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Exercise price | $ 5.48 invest_InvestmentOptionsExercisePrice |  |
Call option, shares | 34.7 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |
Warrant price | $ 7.67 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |
Percentage of common stock price | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Stock options term | 7 years |  |
Test Systems Leased By Customers |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Depreciation over estimated useful life, years | 4 years |  |
Stock Options |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of common stock price | 100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Period of stock granted to employees and executive officers vest in equal annual installments | 4 years |  |

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