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Operating Segment Geographic and Significant Customer Information - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2012 Customer | Dec. 31, 2011 Customer | Dec. 31, 2010 Customer
Segment Reporting Information [Line Items] |  |  |
Number of customer accounted for more than consolidated revenue | 1 | 0 | 0
Major customer, approximate percentage of total revenue | 10.00% | 10.00% | 10.00%

X
- Definition Number Of Customer Accounted For Ten Percent Or Greater Revenue + References No definition available. + Details
Name: | ter_NumberOfCustomerAccountedForTenPercentOrGreaterRevenue
Namespace Prefix: | ter_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent of total consolidated revenue accounted for by major customer for segment reporting + References No definition available. + Details
Name: | ter_SegmentReportingMajorCustomersPercentRevenue
Namespace Prefix: | ter_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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