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Net Income Per Common Share - Additional Information (Detail) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net Income Loss Per Common Share |  |  |
Exercise of stock options | 0.3 ter_StockIssuedDuringPeriodSharesSaleOfStockAndExerciseOfStockOptions | 0.4 ter_StockIssuedDuringPeriodSharesSaleOfStockAndExerciseOfStockOptions | 0.3 ter_StockIssuedDuringPeriodSharesSaleOfStockAndExerciseOfStockOptions
Restricted stock units exercise to purchase shares |  |  | 0.3 ter_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsShares

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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
Name: | ter_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsShares
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