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ACQUISITIONS (NARRATIVE) (DETAILS) (USD $)
 3 Months Ended 1 Months Ended 7 Months Ended
Mar. 31, 2015
Jan. 28, 2014
Aug. 08, 2014
Dec. 31, 2014
Business Acquisition [Line Items]        
Contingent Consideration, at fair value $ 23,953,000us-gaap_BusinessCombinationContingentConsiderationLiability     $ 24,744,000us-gaap_BusinessCombinationContingentConsiderationLiability
Revenue of Acquirees since Acquisition Date, Actual 12,500,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual      
Income (loss) from operations of Acquirees since Acquisition Date, Actual 1,100,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual      
Business Combination Pro Forma Information Amortization Expense of Acquirees Since Acquisition 700,000ttec_BusinessCombinationProFormaInformationAmortizationExpenseOfAcquireesSinceAcquisition      
Sofica [Member]        
Business Acquisition [Line Items]        
Date of Acquisition   Jan. 28, 2014    
Percentage of Voting Interests Acquired   100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= ttec_SoficaMember		    
Description of Acquired Entity   Sofica provides customer lifecycle management and other business process services across multiple channels in multiple sites in over 18 languages.    
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net   14,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ttec_SoficaMember		    
Cost of Acquired Entity, Up Front Cash Consideration   9,400,000ttec_UpFrontCashConsiderationPaidAcquiredEntity
/ us-gaap_BusinessAcquisitionAxis
= ttec_SoficaMember		    
Future Value of Liabilities Incurred From Business Acquisitions   3,800,000ttec_BusinessAcquisitionFutureValueOfLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= ttec_SoficaMember		    
Valuation Technique on Contingent Consideration   The fair value of the contingent consideration was measured based on significant inputs not observable in the market (Level 3 inputs). Key assumptions include a discount rate of 5.0% and expected future value of payments of $4.0 million. The $4.0 million of expected future payments was calculated using a probability weighted EBITDA assessment with the highest probability associated with Sofica achieving the targeted EBITDA for each earn-out year.    
Acquisition hold-back payment   1,000,000ttec_BusinessAcquisitionFutureValueOfLiabilitiesIncurredHoldbackPayment
/ us-gaap_BusinessAcquisitionAxis
= ttec_SoficaMember		    
Discount rate   5.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= ttec_SoficaMember		    
Contingent Consideration Arrangements, Basis for Amount   The total contingent consideration possible per the stock purchase agreement ranges from zero to $7.5 million. Additionally, the purchase price includes a $1.0 million hold-back payment for contingencies as defined in the stock purchase agreement which will be paid in the second quarter of 2016, if required.    
Contingent Consideration, at fair value   4,000,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= ttec_SoficaMember		    
Contingent Consideration, at Fair Value, Current Portion   3,600,000ttec_BusinessCombinationContingentConsiderationCurrentLiability
/ us-gaap_BusinessAcquisitionAxis
= ttec_SoficaMember		    
Contingent Consideration, at Fair Value, Noncurrent Portion   2,800,000ttec_Businesscombinationcontingentconsiderationnoncurrentliability
/ us-gaap_BusinessAcquisitionAxis
= ttec_SoficaMember		    
rogenSi [Member]        
Business Acquisition [Line Items]        
Date of Acquisition     Aug. 08, 2014  
Description of Acquired Entity     rogenSi Worldwide PTY, Ltd., a global leadership, change management, sales, performance training and consulting company.  
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net     34,369,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ttec_RogensiMember		  
Cost of Acquired Entity, Up Front Cash Consideration     18,000,000ttec_UpFrontCashConsiderationPaidAcquiredEntity
/ us-gaap_BusinessAcquisitionAxis
= ttec_RogensiMember		  
Future Value of Liabilities Incurred From Business Acquisitions     15,300,000ttec_BusinessAcquisitionFutureValueOfLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= ttec_RogensiMember		  
Valuation Technique on Contingent Consideration     The fair value of the contingent consideration was measured by applying a probability weighted discounted cash flow model based on significant inputs not observable in the market (Level 3 inputs). Key assumptions include a discount rate of 4.6% and expected future value of payments of $15.3 million. The $15.3 million of expected future payments was calculated using a probability weighted EBITDA assessment with the highest probability associated with rogenSi achieving the targeted EBITDA for each earn-out year.  
Acquisition hold-back payment     1,800,000ttec_BusinessAcquisitionFutureValueOfLiabilitiesIncurredHoldbackPayment
/ us-gaap_BusinessAcquisitionAxis
= ttec_RogensiMember		  
Discount rate     4.60%us-gaap_FairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= ttec_RogensiMember		  
Contingent Consideration Arrangements, Basis for Amount     The total contingent consideration possible per the sale and purchase agreement ranges from zero to $17.6 million and the earn-out payments are payable in early 2015, 2016 and 2017, based on July 1, 2014 through December 31, 2014, and full year 2015 and 2016 performance, respectively.  
Contingent Consideration, at fair value     14,500,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= ttec_RogensiMember		  
Contingent Consideration, at Fair Value, Current Portion     11,300,000ttec_BusinessCombinationContingentConsiderationCurrentLiability
/ us-gaap_BusinessAcquisitionAxis
= ttec_RogensiMember		  
Contingent Consideration, at Fair Value, Noncurrent Portion     $ 4,000,000ttec_Businesscombinationcontingentconsiderationnoncurrentliability
/ us-gaap_BusinessAcquisitionAxis
= ttec_RogensiMember		  
CafeX [Member]        
Business Acquisition [Line Items]        
Cost Method Investments Description

the Company invested $9.0 million in CafeX Communications, Inc. (“CafeX”) through the purchase of a portion of the Series B Preferred Stock of CafeX. After the transaction, the Company owns 17.3% of the total equity of CafeX.