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Debt (Tables) | 3 Months Ended
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Mar. 31, 2013
Components of Convertible Senior Notes | The tables below represent the components of Teradyne’s convertible senior notes:
|  | March 31, 2013 |  |  | December 31, 2012 |
|  | (in thousands) |
Debt principal |  | $ | 189,998 |  |  | $ | 190,000 |
Unamortized debt discount |  |  | 16,350 |  |  |  | 20,104 |
Net carrying amount of the convertible debt |  | $ | 173,648 |  |  | $ | 169,896 |
|  | For the Three Months Ended |
|  | March 31, 2013 |  |  | April 1, 2012 |
|  | (in thousands) |
Contractual interest expense |  | $ | 2,137 |  |  | $ | 2,161 |
Amortization of the discount component and debt issue fees |  |  | 3,957 |  |  |  | 3,479 |
Total interest expense on the convertible debt |  | $ | 6,094 |  |  | $ | 5,640 |

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- Definition Components Of Convertible Senior Notes [Table Text Block] + References No definition available. + Details
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