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Schedule of Segment Reporting Information by Segment Charges and Credit (Detail) $ in Thousands	3 Months Ended
	Apr. 02, 2017 USD ($)
System Test
Segment Reporting Information [Line Items]
Cost of revenues-inventory charge	$ 885

X

- Definition

Cost of revenues-provision for excess and obsolete inventory.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ter_SystemsTestGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: