Schedule of Operating Lease, Maturity (Parenthetical) (Detail) $ in Millions	Dec. 31, 2023 USD ($)
Leases, Operating [Abstract]
Lease liabilities classified as liabilities held for sale	$ 2.5

Lease liabilities classified as liabilities held for sale.

No definition available.

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