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Deferred Revenue and Customer Advances (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Deferred Revenue Arrangement
Customer advances	$ 29,951	$ 39,613
Maintenance, training and extended warranty	50,021	51,198
Undelivered elements	7,466	6,773
Total deferred revenue and customer advances	$ 87,438	$ 97,584

X

- Definition

Deferred revenue and customer advances undelivered elements.

+ References

No definition available.

+ Details

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

X

- Definition

Maintenance, training and extended warranty.

+ References

No definition available.

+ Details

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

X

- Definition

Total deferred revenue and customer advances.

+ References

No definition available.

+ Details

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

X

- Definition

Refundable consideration, usually cash, held by the entity pending satisfactory completion of the entity's obligations or pending the closing of a contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.15a)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Balance Type:	na
Period Type:	duration