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Net Income Per Common Share - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012
Net Income Loss Per Common Share
Exercise of stock options	0.4	0.3
Restricted stock units exercise to purchase shares		1.0

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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