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ACQUISITIONS AND DIVESTITURES (NARRATIVE) (Details) |  |  | 3 Months Ended | 9 Months Ended |  |  |
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Apr. 01, 2022 USD ($) | Apr. 08, 2021 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Entity Number of Employees |  |  | 62,700 |  |  | 62,700 |  |  |  |
Other liabilities, noncurrent |  |  | $ 72,996,000 | $ 79,827,000 |  | $ 72,996,000 |  |  |  |
Redeemable noncontrolling interest |  |  | 55,696,000 | 56,316,000 | $ 55,194,000 | 55,696,000 | $ 55,194,000 | $ 55,752,000 | $ 54,800,000 | $ 52,976,000
Contingent Consideration, at fair value |  |  | 6,439,000 | 9,600,000 |  | 6,439,000 |  |  |  |
Business Combination Contingent Consideration Liability |  |  | 6,439,000 | 9,600,000 |  | 6,439,000 |  |  |  |
Contingent Consideration Receivable Imputed Interest Benefit and Other Adjustments |  |  |  |  |  | (4,447,000) |  |  |  |
Business Combination, Contingent Consideration, Asset |  |  | 5,923,000 | 0 |  | 5,923,000 |  |  |  |
Increase (decrease) in contingent consideration payable |  |  | 2,400,000 |  |  |  |  |  |  |
Revenue of Acquirees since Acquisition Date, Actual |  |  | 96,000,000.0 |  |  | 243,600,000 |  |  |  |
Income (loss) from operations of Acquirees since Acquisition Date, Actual |  |  | 6,000,000.0 |  |  | 16,200,000 |  |  |  |
Sales Revenue Services Net |  |  | 592,453,000 |  | 566,734,000 | 1,785,429,000 | 1,660,747,000 |  |  |
Net income attributable to TTEC stockholders |  |  | 22,249,000 |  | 14,435,000 | 80,887,000 | 112,222,000 |  |  |
Business Acquisition, Pro Forma Revenue |  |  | 592,500,000 |  |  | 1,827,400,000 |  |  |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax |  |  | 22,200,000 |  |  | 85,400,000 |  |  |  |
Other Current Assets [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Asset |  |  | 500,000 |  |  | 500,000 |  |  |  |
TTEC Digital |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Sales Revenue Services Net |  |  | 117,938,000 |  | 124,086,000 | 348,112,000 | 295,668,000 |  |  |
TTEC Engage |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Sales Revenue Services Net |  |  | 474,515,000 |  | 442,648,000 | 1,437,317,000 | $ 1,365,079,000 |  |  |
Faneuil |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses | $ 142,400,000 |  |  |  |  |  |  |  |  |
Avtex |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Date of Acquisition |  | Apr. 08, 2021 |  |  |  |  |  |  |  |
Payments to Acquire Businesses |  | $ 499,946,000 |  |  |  |  |  |  |  |
Base purchase price to acquire businesses |  | 490,000,000.0 |  |  |  |  |  |  |  |
Total purchase price |  | $ 499,946,000 |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities |  |  |  |  | $ 100,000 |  |  |  |  |
Avtex | TTEC Digital |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Avtex | Accounting Standards Update 2021-08 [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Deferred Revenue |  |  |  | 4,900,000 |  |  |  |  |  |
Sales Revenue Services Net |  |  |  | 3,400,000 |  |  |  |  |  |
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% |  |  |  |  |  |  |  |
Faneuil |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Date of Acquisition | Apr. 01, 2022 |  |  |  |  |  |  |  |  |
Total purchase price | $ 142,420,000 |  |  |  |  |  |  |  |  |
Contingent Consideration, at fair value | $ 8,800,000 |  | 6,439,000 |  |  | 6,439,000 |  |  |  |
Number Of Contingent Payments | 2 |  |  |  |  |  |  |  |  |
Business Combination Contingent Consideration Liability | $ 8,800,000 |  | 6,439,000 |  |  | $ 6,439,000 |  |  |  |
Increase (decrease) in contingent consideration payable |  |  | $ 2,400,000 |  |  |  |  |  |  |
Faneuil | Risk Free Interest Rate |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input | 1.7 |  |  |  |  |  |  |  |  |
Faneuil | Expected forecast volatility rate [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input | 20 |  |  |  |  |  |  |  |  |
Faneuil | Discount Rate |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input |  |  | 19.3 |  |  | 19.3 |  |  |  |
Faneuil | Measurement Input, EBITDA Multiple [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input | 19.3 |  |  |  |  |  |  |  |  |
Faneuil | Measurement Input, Revenue Multiple [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input | 7.6 |  |  |  |  |  |  |  |  |
Faneuil | Other Current Assets [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Acquired Receivable, Fair Value | $ 10,400,000 |  |  |  |  |  |  |  |  |
Faneuil | Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair Value of Assets Acquired | $ 300,000 |  |  |  |  |  |  |  |  |
Faneuil | Other Noncurrent Liabilities [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent Consideration, at fair value |  |  | $ 6,400,000 |  |  | $ 6,400,000 |  |  |  |
Business Combination Contingent Consideration Liability |  |  | 6,400,000 |  |  | 6,400,000 |  |  |  |
Faneuil | TTEC Engage |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity | On April 1, 2022, the Company completed an asset acquisition through its subsidiary TTEC Government Solutions LLC, of certain public sector citizen experience contracts in the transportation infrastructure and healthcare exchange industries from Faneuil, Inc., a subsidiary of ALJ Regional Holdings, Inc. (“the Faneuil Transaction”). The business is operated as part of the TTEC Engage segment and was fully consolidated into the financial statements of TTEC. The Faneuil Transaction was recorded as a business combination under ASC 805, Business Combinations, with identifiable assets acquired and liabilities assumed recorded at their estimated fair values as of the acquisition date. |  |  |  |  |  |  |  |  |
Faneuil | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Useful life | 10 years |  |  |  |  |  |  |  |  |
Faneuil receivable [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent Consideration Receivable Imputed Interest Benefit and Other Adjustments |  |  | (4,400,000) |  |  | (4,447,000) |  |  |  |
Business Combination, Contingent Consideration, Asset |  |  | $ 5,923,000 | $ 0 |  | $ 5,923,000 |  |  |  |

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