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IMPAIRMENT OF ASSETS (NARRATIVE) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Impaired Long-Lived Assets Held and Used, Asset Description			Assumptions included the amount and timing of estimated future cash flows and assumed discount rates.
Impaired Long-Lived Assets Held and Used, Method for Determining Fair Value			The amount of impairment recognized is the difference between the carrying value of the asset group and its fair value. To determine fair value, the Company used Level 3 inputs in its discounted cash flows analysis.
Asset Impairment Charges	$ 764	$ 236,716	$ 1,525	$ 236,856
TTEC Digital | Leasehold Improvements Right of Use Lease Assets Capitalized Software Certain Computer Equipment [Member]
Asset Impairment Charges	200	2,500	200	2,500
TTEC Engage | Leasehold Improvements Right of Use Lease Assets Capitalized Software Certain Computer Equipment [Member]
Asset Impairment Charges	$ 600	$ 700	$ 1,300	$ 800

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482130/360-10-45-4

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- Definition

A description of the impaired assets to be held and used by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-2

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- Definition

A description of how an entity determined the fair value of the long-lived asset they are holding and using, for example, whether based on a quoted market price, prices for similar assets, or another valuation technique.

+ References

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-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.CC)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480091/360-10-S99-2

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