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ACQUISITIONS AND DIVESTITURES (NARRATIVE) (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
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Apr. 08, 2021 USD ($) | Nov. 04, 2020 USD ($) item | Aug. 05, 2020 USD ($) | Feb. 07, 2020 USD ($) | Apr. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Number of Employees |  |  |  |  |  | 62,300 |  |  |  |  | 62,300 |  |  |
Other liabilities, noncurrent |  |  |  |  |  | $ 96,919,000 |  | $ 96,185,000 |  |  | $ 96,919,000 |  |  |
Redeemable noncontrolling interest |  |  |  |  |  | 55,194,000 |  | 52,976,000 | $ 53,004,000 | $ 54,026,000 | 55,194,000 | $ 53,004,000 | $ 54,800,000 | $ 48,923,000
Contingent Consideration, at fair value |  |  |  |  |  | 9,478,000 |  | 18,032,000 |  |  | 9,478,000 |  |  |
Business Combination Contingent Consideration Liability |  |  |  |  |  | 9,478,000 |  | 18,032,000 |  |  | 9,478,000 |  |  |
Revenue of Acquirees since Acquisition Date, Actual |  |  |  |  |  |  |  |  |  |  | 130,400,000 |  |  |
Income (loss) from operations of Acquirees since Acquisition Date, Actual |  |  |  |  |  |  |  |  |  |  | 9,900,000 |  |  |
Acquired intangible amortization of acquirees since acquisition |  |  |  |  |  |  |  |  |  |  | 11,800,000 |  |  |
Sales Revenue Services Net |  |  |  |  |  | 566,734,000 |  |  | 492,980,000 |  | 1,660,747,000 | 1,378,274,000 |  |
Net income attributable to TTEC stockholders |  |  |  |  |  | 14,435,000 |  |  | 21,366,000 |  | 112,222,000 | 74,225,000 |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  |  |  |  |  | 1,707,800,000 | 1,516,300,000 |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax |  |  |  |  |  |  |  |  |  |  | 115,000,000.0 | 83,700,000 |  |
(Gain) Loss on dissolution of subsidiary |  |  |  |  |  |  |  |  |  |  |  | (19,905,000) |  |
Foreign Subsidiary 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Gain) Loss on dissolution of subsidiary |  |  |  |  |  |  |  |  |  | $ 2,500,000 |  |  |  |
Foreign Subsidiary 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Gain) Loss on dissolution of subsidiary |  |  |  |  |  |  |  |  | 17,400,000 |  |  |  |  |
TTEC Digital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Revenue Services Net |  |  |  |  |  | 124,086,000 |  |  | 76,571,000 |  | 295,668,000 | 231,270,000 |  |
TTEC Engage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Revenue Services Net |  |  |  |  |  | $ 442,648,000 |  |  | $ 416,409,000 |  | $ 1,365,079,000 | $ 1,147,004,000 |  |
Serendebyte |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
ownership percentage |  |  |  |  |  | 70.00% |  |  |  |  | 70.00% |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |
Avtex |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Acquisition | Apr. 08, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity | 100% of the outstanding stock of Avtex Solutions Holdings, LLC (“Avtex”). Avtex is an end-to-end customer experience and CXaaS solutions provider with offerings in Genesys and Microsoft cloud solutions |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses | $ 500,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Base purchase price to acquire businesses | 490,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price | $ 499,945,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |
Avtex | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |
Avtex | Trade Names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Avtex | Intellectual Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Avtex | Avtex |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
ownership percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
VoiceFoundry US |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Acquisition |  |  | Aug. 05, 2020 |  |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity |  |  | VoiceFoundry is a preferred Amazon Connect cloud contact center service and implementation partner |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses |  |  | $ 34,300,000 |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  | 45,884,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |
Future Value of Liabilities Incurred From Business Acquisitions |  |  | $ 7,400,000 |  |  | 10,900,000 |  |  |  |  | 10,900,000 |  |  |
Contingent Consideration, at fair value |  |  |  |  |  | 7,390,000 |  | 14,085,000 |  |  | 7,390,000 |  |  |
Business Combination Contingent Consideration Liability |  |  |  |  |  | 7,390,000 |  | 14,085,000 |  |  | $ 7,390,000 |  |  |
Increase (decrease) in contingent consideration payable |  |  |  |  | $ (7,400,000) | $ (200,000) | $ (500,000) | (3,200,000) |  |  |  |  |  |
VoiceFoundry US | Risk Free Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input |  |  | 2.6 |  |  |  |  |  |  |  |  |  |  |
VoiceFoundry US | Expected forecast volatility rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input |  |  | 47 |  |  |  |  |  |  |  |  |  |  |
VoiceFoundry US | Discount Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input |  |  | 23.1 |  |  | 23.1 |  |  |  |  | 23.1 |  |  |
VoiceFoundry US | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |
VoiceFoundry US | Trade Names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
VoiceFoundry US | VoiceFoundry US |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
ownership percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
VoiceFoundry ASEAN |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Acquisition |  | Nov. 04, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses |  | $ 15,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  | 18,230,000 |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |
Future Value of Liabilities Incurred From Business Acquisitions |  | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Contingent Consideration, at fair value |  |  |  |  |  | 2,088,000 |  | 3,947,000 |  |  | $ 2,088,000 |  |  |
Number Of Contingent Payments | item |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Contingent Payment Period |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Business Combination Contingent Consideration Liability |  |  |  |  |  | 2,088,000 |  | 3,947,000 |  |  | $ 2,088,000 |  |  |
Increase (decrease) in contingent consideration payable |  |  |  |  | $ 2,200,000 | $ 100,000 | $ (400,000) | $ (1,200,000) |  |  |  |  |  |
VoiceFoundry ASEAN | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | $ 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |
VoiceFoundry ASEAN | Risk Free Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input |  | 1.6 |  |  |  |  |  |  |  |  |  |  |  |
VoiceFoundry ASEAN | Expected forecast volatility rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input |  | 50 |  |  |  |  |  |  |  |  |  |  |  |
VoiceFoundry ASEAN | Discount Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input |  | 18.4 |  |  |  | 18.4 |  |  |  |  | 18.4 |  |  |
VoiceFoundry ASEAN | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |
VoiceFoundry ASEAN | Trade Names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
VoiceFoundry ASEAN | VoiceFoundry ASEAN |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
ownership percentage |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Serendebyte |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Acquisition |  |  |  | Feb. 07, 2020 |  |  |  |  |  |  |  |  |  |
Percentage of Voting Interests Acquired |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity |  |  |  | Serendebyte Inc., a Delaware corporation (“the Serendebyte Transaction”). Serendebyte is an autonomous customer experience and intelligent automation solutions provider based in India, the United States, and Canada |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  | $ 12,928,000 |  |  |  |  |  |  |  |  |  |
Cash balance retained |  |  |  | 2,200,000 |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest |  |  |  | $ 3,800,000 |  |  |  |  |  |  |  |  |  |
Serendebyte | Discount Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unobservable Measurement Input, Uncertainty, Description |  |  |  | 35% |  |  |  |  |  |  |  |  |  |
Serendebyte | TTEC Digital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Voting Interests Acquired |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses |  |  |  | $ 9,000,000.0 |  |  |  |  |  |  | $ 800,000 |  |  |
Serendebyte | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Serendebyte | Trade Names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |

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