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v2.4.1.9

Debt - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2009 | Mar. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2014 | Mar. 13, 2014 | Apr. 01, 2009 | Apr. 05, 2015
Debt Instrument |  |  |  |  |  |  |
Borrowings from local bank | $ 10,000,000 us-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 | 6,000,000 us-gaap_MortgageLoansOnRealEstate |  |  |  |  |  |
Unsecured loan | 4,000,000 us-gaap_UnsecuredDebt |  |  |  |  |  |
Semiannual principal payments of loan |  | 1,000,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal | 1,000,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal |  |  |  |
Payments of long-term debt |  | 190,975,000 us-gaap_RepaymentsOfLongTermDebt |  |  |  |  |
Common stock shares were issued for warrants exercised |  |  |  | 21,200,000 ter_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrants |  |  |
Strike price per share of warrant |  |  |  | $ 7.6348 ter_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 |  |  |  |  |  |
Aggregate principal amount | 175,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |  |  |  |  | 190,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
Additional aggregate principal amount | 1,000 ter_AdditionalAggregatePrincipalAmount / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |  |  |  |  | 15,000,000 ter_AdditionalAggregatePrincipalAmount / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |
Senior notes maturity date | Mar. 15, 2014 |  |  |  |  | Mar. 15, 2014 |
Conversion rate in number of shares | 182.65 ter_CommonSharesAttributableToConversionOfDebtInstrument / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |  |  | 131.95 ter_CommonSharesAttributableToConversionOfDebtInstrument / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |  |  |
Number of shares excluded for conversion rate calculation |  |  |  | 50.7 ter_CommonStockSharesExcludingSubjectToConversion / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |  |  |
Trading days used to determine average price per share |  |  |  | 25 days |  |  |
Average trading price of common shares |  |  |  | $ 19.74 us-gaap_DebtInstrumentConvertibleStockPriceTrigger / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |  |  |
Payments of long-term debt |  |  |  |  |  |  | $ 190,000,000 us-gaap_RepaymentsOfLongTermDebt / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember
Stock issued in conversion of notes |  |  |  |  |  |  | 25,100,000 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember
Stock received and retired |  |  |  |  | 25,100,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_DebtInstrumentAxis = ter_FourPointFiveZeroPercentConvertibleSeniorNotesDueMarchFifteenTwoThousandFourteenMember |  |

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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. + References No definition available. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Total carrying amount of mortgage loans as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
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