Subsequent Events - Additional Information (Detail)	1 Months Ended
Jan. 31, 2022 $ / shares
Subsequent Event [Line Items]
Cash Dividends payable, amount per share	$ 0.11
Cash Dividends payable, date to be paid	Mar. 18, 2022
Subsequent Event
Subsequent Event [Line Items]
Cash Dividends payable, record date	Feb. 18, 2022
Percentage of increase in cash dividend rate per share	10.00%

Percentage of Increase in Cash Dividend Rate Per Share

No definition available.

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Namespace Prefix:	ter_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the declared dividend will be paid, in YYYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Date the holder must own the stock to be entitled to the dividend, in YYYY-MM-DD format.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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