Debt - Additional Information (Detail) (USD $)
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0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | ||||
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Mar. 31, 2009
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Mar. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Mar. 13, 2014
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Apr. 01, 2009
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Debt Instrument | ||||||||
Borrowings from local bank | $ 10,000,000us-gaap_LoansPayableToBank | |||||||
Term of loan, years | 5 years | |||||||
Debt instrument, interest rate, stated percentage | 0.80%us-gaap_DebtInstrumentInterestRateStatedPercentage | |||||||
Loan collateralized by real estate mortgage | 6,000,000us-gaap_MortgageLoansOnRealEstate | |||||||
Unsecured loan | 4,000,000us-gaap_UnsecuredDebt | |||||||
Semiannual principal payments of loan | 1,000,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal | 1,000,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal | ||||||
Aggregate principal amount | 189,998,000us-gaap_DebtInstrumentFaceAmount | |||||||
Payments of long-term debt | 190,972,000us-gaap_RepaymentsOfLongTermDebt | 2,534,000us-gaap_RepaymentsOfLongTermDebt | 2,533,000us-gaap_RepaymentsOfLongTermDebt | |||||
Common stock shares were issued for warrants exercised | 21,200,000ter_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrants | |||||||
Strike price per share of warrant | $ 7.6348ter_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsIssued | |||||||
4.50% Convertible Senior Notes Due March 15, 2014 | ||||||||
Debt Instrument | ||||||||
Debt instrument, interest rate, stated percentage | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
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Aggregate principal amount | 175,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
190,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
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Additional aggregate principal amount | 1,000ter_AdditionalAggregatePrincipalAmount / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
15,000,000ter_AdditionalAggregatePrincipalAmount / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
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Senior notes maturity date | Mar. 15, 2014 | Mar. 15, 2014 | ||||||
Conversion rate in number of shares | 182.65ter_CommonSharesAttributableToConversionOfDebtInstrument / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
131.95ter_CommonSharesAttributableToConversionOfDebtInstrument / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
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Number of shares excluded for conversion rate calculation | 50.7ter_CommonStockSharesExcludingSubjectToConversion / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
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Trading days used to determine average price per share | 25 days | |||||||
Average trading price of common shares | $ 19.74us-gaap_DebtInstrumentConvertibleStockPriceTrigger / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
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Payments of long-term debt | $ 190,000,000us-gaap_RepaymentsOfLongTermDebt / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
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Stock issued in conversion of notes | 25,100,000us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
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Stock received and retired | 25,100,000us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
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- Definition
Additional aggregate principal amount. No definition available.
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- Definition
Class Of Warrant Or Right Exercise Price Of Warrants Or Rights Issued No definition available.
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- Definition
Class Of Warrant Or Right Number Of Securities Called By Warrants No definition available.
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- Definition
Common Shares Attributable To Conversion Of Debt Instrument No definition available.
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- Definition
Common Stock Shares Excluding Subject To Conversion No definition available.
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- Definition
Number Of Trading Period Consider For Weight Average Price Of Common Stock. No definition available.
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- Definition
The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective. No definition available.
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- Definition
Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the required periodic payments applied to principal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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- Definition
Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Total carrying amount of mortgage loans as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of shares that have been repurchased and retired during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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