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Net Income Per Common Share - Additional Information (Detail) In Millions, unless otherwise specified | 3 Months Ended
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Apr. 05, 2015 | Mar. 30, 2014
Net Income Loss Per Common Share |  |
Exercise of stock options | 0.2 ter_StockIssuedDuringPeriodSharesSaleOfStockAndExerciseOfStockOptions | 0.4 ter_StockIssuedDuringPeriodSharesSaleOfStockAndExerciseOfStockOptions

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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