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Debt - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  | 3 Months Ended | 6 Months Ended |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended
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Mar. 31, 2009 Y | Mar. 30, 2012 | Jun. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Convertible Notes Hedge Warrant | Jul. 01, 2012 Convertible Notes Hedge Warrant | Jun. 30, 2013 Convertible Notes Hedge Warrant | Jul. 01, 2012 Convertible Notes Hedge Warrant | Mar. 31, 2009 Convertible Notes Hedge Warrant | Jun. 30, 2013 Convertible Senior Notes | Apr. 30, 2009 4.50% Convertible Senior Notes Due March 15, 2014 | Mar. 31, 2009 4.50% Convertible Senior Notes Due March 15, 2014 | Jun. 30, 2013 4.50% Convertible Senior Notes Due March 15, 2014 D | Jun. 30, 2013 4.50% Convertible Senior Notes Due March 15, 2014 | Aug. 09, 2013 Subsequent Event 4.50% Convertible Senior Notes Due March 15, 2014
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured loan | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Semiannual principal payments of loan |  | 1,000,000 |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Outstanding loan principal amount |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | 189,998,000 |  | 190,000,000 |  |  |  |  |  |  | 190,000,000 |  |  |  |
Senior notes maturity date |  |  |  |  |  |  |  |  |  |  |  | March 15, 2014 |  |  |  |
Initial conversion rate in number of shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 182.65 |
Additional aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |
Initial debt conversion price |  |  | $ 5.48 |  |  | $ 7.67 | $ 7.67 | $ 7.67 | $ 7.67 | $ 7.67 |  |  | $ 5.48 |  |  |
Debt conversion premium percentage |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
Last reported sale price per share of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.38 |  |  |
Initial conversion rate |  |  | The Notes may be converted, at the option of the holder, 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. |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold trading days |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |
Threshold consecutive trading days |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |
Threshold percentage of stock price trigger |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |
Stock price trigger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000
Antidilution adjustments, shares |  |  | 34,703,196 |  |  | 34,700,000 | 34,700,000 | 34,700,000 | 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  |  | 12,466,000 |  | 20,104,000 |  |  |  |  |  | 12,500,000 |  |  |  |  |
Amortization period of unamortized discount, months |  |  | 9 months |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of equity component |  |  | 63,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument conversion price |  |  | $ 5.48 |  |  |  |  |  |  |  |  |  |  |  |  |
If-converted value of notes |  |  | $ 609,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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