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Accounting Policies (Policies) | 3 Months Ended
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Mar. 31, 2013
Basis of Presentation | Basis of Presentation The condensed consolidated interim financial statements include the accounts of Teradyne and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated. These interim financial statements are unaudited and reflect all normal recurring adjustments that are, in the opinion of management, necessary for the fair presentation of such interim financial statements. Certain prior year’s amounts were reclassified to conform to the current year presentation. The December 31, 2012 condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. The accompanying financial information should be read in conjunction with the consolidated financial statements and notes thereto contained in Teradyne’s Annual Report on Form 10-K, filed with the U.S. Security and Exchange Commission (“SEC”) on March 1, 2013, for the year ended December 31, 2012.
Preparation of Financial Statements and Use of Estimates | Preparation of Financial Statements and Use of Estimates The preparation of consolidated financial statements requires management to make estimates and judgments that affect the amounts reported in the financial statements. Actual results may differ significantly from these estimates.

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- Definition Preparation Of Financial Statements And Use Of Estimates [Policy Text Block] + References No definition available. + Details
Name: | ter_PreparationOfFinancialStatementsAndUseOfEstimatesPolicyTextBlock
Namespace Prefix: | ter_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References No definition available. + Details
Name: | us-gaap_BasisOfAccountingPolicyPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration