Property Plant and Equipment, Net (Parenthetical) (Detail) $ in Millions	Dec. 31, 2023 USD ($)
Property, Plant and Equipment [Abstract]
Property, plant and equipment, net classified as assets held for sale	$ 9.0

Property, plant and equipment, net classified as assets held for sale.

No definition available.

Name:	ter_PropertyPlantAndEquipmentNetClassifiedAsAssetsHeldForSale
Namespace Prefix:	ter_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant