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Composition of Inventories, Net (Parenthetical) (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Inventory Disclosure [Abstract] |  |
Inventory work in process held for sale | $ 19.3 | $ 18.0

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- Definition Inventory work in process held for sale. + References No definition available. + Details
Name: | ter_InventoryWorkInProcessHeldForSale
Namespace Prefix: | ter_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration