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ACQUISITIONS AND DIVESTITURES (NARRATIVE) (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
Apr. 01, 2022
USD ($)
May 31, 2023
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
Business Acquisition [Line Items]                      
Other Liabilities, Noncurrent $ 67,860     $ 64,139   $ 64,139   $ 67,860      
Revenue from Contract with Customer, Excluding Assessed Tax       513,571 $ 534,085 1,047,799 $ 1,110,723        
Net Income (Loss)       (7,987) (299,539) (6,603) (301,844)        
Leasehold Improvements [Member]                      
Business Acquisition [Line Items]                      
Asset, Held-for-Sale, Not Part of Disposal Group, Other         16,700   16,700        
Building [Member]                      
Business Acquisition [Line Items]                      
Asset, Held-for-Sale, Not Part of Disposal Group, Other         6,700   6,700        
Former Headquarters Building [Member]                      
Business Acquisition [Line Items]                      
Asset, Held-for-Sale, Not Part of Disposal Group, Other         29,400   29,400        
Land [Member]                      
Business Acquisition [Line Items]                      
Asset, Held-for-Sale, Not Part of Disposal Group, Other         5,900   5,900        
Other Capitalized Property Plant and Equipment [Member]                      
Business Acquisition [Line Items]                      
Asset, Held-for-Sale, Not Part of Disposal Group, Other         100   100        
TTEC Digital                      
Business Acquisition [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax       113,746 $ 116,368 221,786 228,399        
TTEC Digital | Former Headquarters Building [Member]                      
Business Acquisition [Line Items]                      
Assets held for sale asset allocation percentage by reporting unit         15.00%            
TTEC Engage                      
Business Acquisition [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax       $ 399,825 $ 417,717 $ 826,013 $ 882,324        
TTEC Engage | Former Headquarters Building [Member]                      
Business Acquisition [Line Items]                      
Assets held for sale asset allocation percentage by reporting unit         85.00%            
Faneuil                      
Business Acquisition [Line Items]                      
Payments to Acquire Businesses, Gross   $ 142,400                  
Faneuil                      
Business Acquisition [Line Items]                      
Business Acquisition, Date of Acquisition Agreement   Apr. 01, 2022                  
Payments Made To Contingent Consideration Receivable During Period     $ 7,400                
Contingent Consideration Payable Imputed Interest Expense and Other Adjustments               1,500      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ 0               $ (3,000) $ 2,900  
Faneuil | Minimum [Member]                      
Business Acquisition [Line Items]                      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High                     $ 7,400
Faneuil | Maximum [Member]                      
Business Acquisition [Line Items]                      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High                     $ 10,400
Faneuil | Measurement Input, Discount Rate [Member]                      
Business Acquisition [Line Items]                      
Business combination contingent consideration measurement input       19.3   19.3          
Faneuil | Other Operating Income (Expense) [Member]                      
Business Acquisition [Line Items]                      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability               $ 1,500 $ 3,000    
Faneuil | TTEC Engage                      
Business Acquisition [Line Items]                      
Business Acquisition, 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 acquired 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.