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Net Income Per Common Share - Additional Information (Detail) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2013 | Sep. 30, 2012 | Sep. 29, 2013 | Sep. 30, 2012
Net Income Loss Per Common Share |  |  |  |
Exercise of stock options | 0.4 | 0.3 | 0.4 | 0.3
Restricted stock units exercise to purchase shares |  | 0.1 |  | 0.4

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- Definition Issuance of ordinary shares upon exercise of employee stock options and restricted stock units, shares. + References No definition available. + Details
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Namespace Prefix: | ter_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ter_NetIncomeLossPerCommonShareLineItems
Namespace Prefix: | ter_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Stock Issued During Period Shares Sale Of Stock And Exercise Of Stock Options + References No definition available. + Details
Name: | ter_StockIssuedDuringPeriodSharesSaleOfStockAndExerciseOfStockOptions
Namespace Prefix: | ter_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration