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Restructuring and Other - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Restructuring Cost and Reserve
Business acquisition, contingent consideration	$ 6.5		$ 8.4
Remaining accrual for lease payments		$ 0.6
Lease expiration date		Oct. 31, 2013

X

- Definition

Change Of Business Acquisition Contingent Consideration At Fair Value

+ References

No definition available.

+ Details

Name:	ter_ChangeOfBusinessAcquisitionContingentConsiderationAtFairValue
Namespace Prefix:	ter_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Remaining accrual for lease payments.

+ References

No definition available.

+ Details

Name:	ter_RemainingAccrualForLeasePayments
Namespace Prefix:	ter_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RestructuringCostAndReserveLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration