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Debt - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2009 Y | Mar. 30, 2012 | Sep. 30, 2012 | Dec. 31, 2012 M D | Dec. 31, 2011 | Apr. 30, 2009 | Apr. 06, 2009 | Mar. 31, 2009 4.50% Convertible Senior Notes Due March 15, 2014 | Apr. 30, 2009 Convertible Senior Notes | Dec. 31, 2012 Convertible Senior Notes | Apr. 30, 2009 4.50% Convertible Senior Notes | Mar. 31, 2009 4.50% Convertible Senior Notes | Dec. 31, 2012 4.50% Convertible Senior Notes | Dec. 31, 2010 Convertible Notes Hedge Warrant | Dec. 31, 2012 Convertible Notes Hedge Warrant | Dec. 31, 2011 Convertible Notes Hedge Warrant | Mar. 31, 2009 Convertible Notes Hedge Warrant | Dec. 31, 2012 Current Debt | Dec. 31, 2012 Long-term Debt
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings from local bank | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of loan, years | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 0.80% |  |  |  |  |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |
Loan collateralized by real estate mortgage | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan collateralized by real estate mortgage net book value |  |  |  | 12,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured loan | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Semiannual principal payments of loan |  | 1,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding loan principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 | 1,200,000
Aggregate principal amount |  |  |  | 190,000,000 | 190,000,000 | 190,000,000 | 190,000,000 | 175,000,000 |  | 190,000,000 |  |  |  |  |  |  |  |  |
Additional aggregate principal amount |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  | 1,000 |  |  |  |  |  |
Senior notes maturity date |  |  |  |  |  |  |  |  |  |  | March 15, 2014 |  |  |  |  |  |  |  |
Initial conversion rate in number of shares |  |  |  |  |  |  |  |  |  |  |  |  | 182.65 |  |  |  |  |  |
Initial debt conversion price |  |  |  | $ 5.48 |  |  |  |  |  |  |  | $ 5.48 |  | $ 7.67 | $ 7.67 | $ 7.67 | $ 7.67 |  |
Debt conversion premium percentage |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
Last reported sale price per share of debt |  |  |  |  |  |  |  |  |  |  |  | $ 4.38 |  |  |  |  |  |  |
Initial conversion rate |  |  |  | The Notes may be converted, under certain circumstances and during certain periods, at an initial conversion rate of approximately 182.65 shares of Teradyne's common stock per $1,000 principal amount of Notes, which is equivalent to an initial conversion price of approximately $5.48, a 25% conversion premium based on the last reported sale price of $4.38 per share of Teradyne's common stock on March 31, 2009. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business days as measurement period for conversion of notes |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days as measurement period for conversion of notes |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion period before expiration, period, months |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum price per Note for each day of that measurement period |  |  |  | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of common stock for trading days, number of days |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consecutive trading days |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of increase in conversion price |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of acquisition of total voting shares |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilution adjustments, shares |  |  |  | 34,703,196 |  |  |  |  |  |  |  |  |  | 34,700,000 |  |  |  |  |
Convertible note hedges |  |  |  | 64,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strike price per share of warrant | $ 7.67 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of warrant price in excess of closing price of common stock | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from warrants | 43,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants conversion premium percentage | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing transaction |  |  |  |  |  |  | 163,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of equity component |  |  |  | 63,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective annual interest rate on notes |  |  |  | 14.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of amortization, years |  |  |  |  |  |  |  |  |  | Five |  |  |  |  |  |  |  |  |
Debt issuance costs, amortized to interest expense |  |  |  |  |  |  |  |  |  | 4,100,000 |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |
Unamortized discount |  |  |  | 20,104,000 | 33,902,000 |  |  |  |  | 20,100,000 |  |  |  |  |  |  |  |  |
Amortization period of unamortized discount, years |  |  |  | 1 year 3 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument conversion price |  |  |  | $ 5.48 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
If-converted value of notes |  |  |  | $ 586,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + 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 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: 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=6882300&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: 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 + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 210.7-03.1(c)) -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 03 -Paragraph 1 -Subparagraph c -Article 7 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References No definition available. + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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