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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 05, 2015
Purchase Commitment, Excluding Long-term Commitment
Aggregate purchase commitments	189.5ter_AggregatePurchaseCommitments
Purchase commitments less than one year	180.8ter_ShortTermPurchaseCommitments
Maximum
Purchase Commitment, Excluding Long-term Commitment
Purchase commitments period	1 year

X

- Definition

Aggregate purchase commitments.

+ References

No definition available.

+ Details

Name:	ter_AggregatePurchaseCommitments
Namespace Prefix:	ter_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

+ References

No definition available.

+ Details

Name:	ter_ShortTermPurchaseCommitments
Namespace Prefix:	ter_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Short Term Purchase Commitment Time Period

+ References

No definition available.

+ Details

Name:	ter_ShortTermPurchaseCommitmentTimePeriod
Namespace Prefix:	ter_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: