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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Components of Convertible Senior Notes | The below tables represents the key components of Teradyne’s convertible senior notes:
|  | December 31, 2017 |  |  | December 31, 2016 |
|  | (in thousands) |  |  | (in thousands) |
Debt Principal |  | $ | 460,000 |  |  | $ | 460,000 |
Unamortized discount |  |  | 94,013 |  |  |  | 107,331 |
Net Carrying amount of convertible debt |  | $ | 365,987 |  |  | $ | 352,669 |
|  | For the year ended |
|  | December 31, 2017 |  |  | December 31, 2016 |
|  | (in thousands) |  |  | (in thousands) |
Contractual interest expense on the coupon |  | $ | 5,734 |  |  | $ | 303 |
Amortization of the discount component and debt issue fees recognized as interest expense |  |  | 13,318 |  |  |  | 688 |
Total interest expense on the convertible debt |  | $ | 19,052 |  |  | $ | 991 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration