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ACQUISITIONS (NARRATIVE) (DETAILS) (USD $) | 12 Months Ended | 7 Months Ended | 1 Months Ended | 7 Months Ended | 2 Months Ended | 9 Months Ended | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Aug. 08, 2014 | Jan. 28, 2014 | Aug. 09, 2013 | Feb. 27, 2012 | Oct. 04, 2012 | Jun. 30, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Future Value of Liabilities Incurred From Business Acquisitions | $ 25,700,000ttec_BusinessAcquisitionFutureValueOfLiabilitiesIncurred |  |  |  |  |  |  |  |
Contingent Consideration, at fair value |  |  | 16,990,000us-gaap_BusinessCombinationContingentConsiderationLiability |  |  |  |  |  |
Contingent consideration payments during period | (9,144,000)ttec_ContingentConsiderationPaymentsDuringPeriod | (1,100,000)ttec_ContingentConsiderationPaymentsDuringPeriod |  |  |  |  |  |  |
Revenue of Acquirees since Acquisition Date, Actual | 91,900,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual | 69,100,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual | 8,900,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual |  |  |  |  |  |
Income (loss) from operations of Acquirees since Acquisition Date, Actual | 7,700,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual | 10,000,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual | 1,400,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual |  |  |  |  |  |
Business Combination Pro Forma Information Amortization Expense Of Acquirees Since Acquisition | 6,300,000ttec_BusinessCombinationProFormaInformationAmortizationExpenseOfAcquireesSinceAcquisition | 4,200,000ttec_BusinessCombinationProFormaInformationAmortizationExpenseOfAcquireesSinceAcquisition | 400,000ttec_BusinessCombinationProFormaInformationAmortizationExpenseOfAcquireesSinceAcquisition |  |  |  |  |  |
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. |  |  |  |  |
Total Purchase Price |  |  |  | 34,265,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ttec_RogensiMember |  |  |  |  |
Cost of Acquired Entity, Up Front Cash Consideration |  |  |  | 18,000,000ttec_UpFrontCashConsiderationPaidAcquiredEntity / us-gaap_BusinessAcquisitionAxis = ttec_RogensiMember |  |  |  |  |
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. |  |  |  |  |  |  |  |
Future Value of Liabilities Incurred From Business Acquisitions |  |  |  | 15,300,000ttec_BusinessAcquisitionFutureValueOfLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = ttec_RogensiMember |  |  |  |  |
Contingent Consideration Arrangements, Basis for Amount - Range Description |  |  |  | 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 |  |  |  |  |
Discount rate |  |  |  | 4.60%us-gaap_FairValueInputsDiscountRate / us-gaap_BusinessAcquisitionAxis = ttec_RogensiMember |  |  |  |  |
Measurement period adjustment - Other accrued expenses | 6,400,000ttec_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAccruedExpenses / us-gaap_BusinessAcquisitionAxis = ttec_RogensiMember |  |  |  |  |  |  |  |
Measurement period adjustment - Other noncurrent liabilities | 8,800,000ttec_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherNoncurrentLiabilities / us-gaap_BusinessAcquisitionAxis = ttec_RogensiMember |  |  |  |  |  |  |  |
Acquisiton hold-back payment |  |  |  | 1,800,000ttec_BusinessAcquisitionFutureValueOfLiabilitiesIncurredHoldbackPayment / us-gaap_BusinessAcquisitionAxis = ttec_RogensiMember |  |  |  |  |
rogenSi [Member] | Customer relationships, gross [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Weighted Average Useful Life of Acquired Intangible Assets |  |  |  | 5 years 0 months 0 days |  |  |  |  |
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. |  |  |  |
Total Purchase Price |  |  |  |  | 14,172,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ttec_SoficaMember |  |  |  |
Cost of Acquired Entity, Up Front Cash Consideration |  |  |  |  | 9,400,000ttec_UpFrontCashConsiderationPaidAcquiredEntity / us-gaap_BusinessAcquisitionAxis = ttec_SoficaMember |  |  |  |
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. |  |  |  |  |  |  |  |
Future Value of Liabilities Incurred From Business Acquisitions |  |  |  |  | 4,000,000ttec_BusinessAcquisitionFutureValueOfLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = ttec_SoficaMember |  |  |  |
Contingent Consideration Arrangements, Basis for Amount - Range Description |  |  |  |  | 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. |  |  |  |
Discount rate |  |  |  |  | 5.00%us-gaap_FairValueInputsDiscountRate / us-gaap_BusinessAcquisitionAxis = ttec_SoficaMember |  |  |  |
Measurement period adjustment - Other accrued expenses | 2,800,000ttec_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAccruedExpenses / us-gaap_BusinessAcquisitionAxis = ttec_SoficaMember |  |  |  |  |  |  |  |
Measurement period adjustment - Other noncurrent liabilities | 3,500,000ttec_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherNoncurrentLiabilities / us-gaap_BusinessAcquisitionAxis = ttec_SoficaMember |  |  |  |  |  |  |  |
Acquisiton hold-back payment |  |  |  |  | 1,000,000ttec_BusinessAcquisitionFutureValueOfLiabilitiesIncurredHoldbackPayment / us-gaap_BusinessAcquisitionAxis = ttec_SoficaMember |  |  |  |
Sofica [Member] | Customer relationships, gross [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Weighted Average Useful Life of Acquired Intangible Assets |  |  |  |  | 6 years 0 months 0 days |  |  |  |
Sofica [Member] | Trade name - indefinite life [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Weighted Average Useful Life of Acquired Intangible Assets |  |  |  |  | 3 years 0 months 0 days |  |  |  |
Sofica [Member] | NonCompeteAgreement |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Weighted Average Useful Life of Acquired Intangible Assets |  |  |  |  | 5 years 0 months 0 days |  |  |  |
WebMetro [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Date of Acquisition |  |  |  |  |  | Aug. 09, 2013 |  |  |
Percentage of Voting Interests Acquired |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ttec_WebmetroMember |  |  |
Total Purchase Price |  |  |  |  |  | 17,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ttec_WebmetroMember |  |  |
Cost of Acquired Entity, Up Front Cash Consideration |  |  |  |  |  | 15,300,000ttec_UpFrontCashConsiderationPaidAcquiredEntity / us-gaap_BusinessAcquisitionAxis = ttec_WebmetroMember |  |  |
Valuation Technique on Contingent Consideration | The fair value of the contingent payments was measured based on significant inputs not observable in the market (Level 3 inputs). Key assumptions include a discount rate of 5.3% and expected future value of payments of $2.6 million. The $2.6 million of expected future payments was calculated using a bell curve probability weighted EBITDA assessment with the highest probability associated with WebMetro achieving the targeted EBITDA for each earn-out year. |  |  |  |  |  |  |  |
Future Value of Liabilities Incurred From Business Acquisitions |  |  |  |  |  | 2,600,000ttec_BusinessAcquisitionFutureValueOfLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = ttec_WebmetroMember |  |  |
Contingent Consideration, at fair value |  |  |  |  |  | 2,500,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = ttec_WebmetroMember |  |  |
Discount rate |  |  |  |  |  | 5.30%us-gaap_FairValueInputsDiscountRate / us-gaap_BusinessAcquisitionAxis = ttec_WebmetroMember |  |  |
Iknowtion [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Date of Acquisition |  |  |  |  |  |  | Feb. 27, 2012 |  |
Percentage of Voting Interests Acquired |  |  |  |  |  |  | 80.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ttec_IknowtionMember |  |
Description of Acquired Entity |  |  |  |  |  |  | iKnowtion integrates proven marketing analytics methodologies and business consulting capabilities to help clients improve their return on marketing expenditures in such areas as demand generation, share of wallet, and channel mix optimization. |  |
Cost of Acquired Entity, Up Front Cash Consideration |  |  |  |  |  |  | 1,200,000ttec_UpFrontCashConsiderationPaidAcquiredEntity / us-gaap_BusinessAcquisitionAxis = ttec_IknowtionMember |  |
Valuation Technique on Contingent Consideration | The fair value of the contingent payments was measured based on significant inputs not observable in the market (Level 3 inputs). Key assumptions include a discount rate of 21% and expected future value of payments of $4.3 million. The $4.3 million of expected future payments was calculated using a probability weighted EBITDA assessment with higher probability associated with iKnowtion achieving the maximum EBITDA targets. |  |  |  |  |  |  |  |
Future Value of Liabilities Incurred From Business Acquisitions |  |  |  |  |  |  | 4,300,000ttec_BusinessAcquisitionFutureValueOfLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = ttec_IknowtionMember |  |
Contingent Consideration, at fair value |  |  |  |  |  |  | 2,900,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = ttec_IknowtionMember |  |
Discount rate |  |  |  |  |  |  | 21.00%us-gaap_FairValueInputsDiscountRate / us-gaap_BusinessAcquisitionAxis = ttec_IknowtionMember |  |
Measurement period adjustment - Other accrued expenses | 1,800,000ttec_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAccruedExpenses / us-gaap_BusinessAcquisitionAxis = ttec_IknowtionMember |  |  |  |  |  |  |  |
Measurement period adjustment - Other noncurrent liabilities | 500,000ttec_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherNoncurrentLiabilities / us-gaap_BusinessAcquisitionAxis = ttec_IknowtionMember |  |  |  |  |  |  |  |
Guidon [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Date of Acquisition |  |  |  |  |  |  |  | Oct. 04, 2012 |
Percentage of Voting Interests Acquired |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ttec_GuidonMember |
Description of Acquired Entity |  |  |  |  |  |  |  | Guidon provides operational consulting services and designs solutions for operational and cultural transformation for global clients. |
Cost of Acquired Entity, Up Front Cash Consideration |  |  |  |  |  |  |  | 5,700,000ttec_UpFrontCashConsiderationPaidAcquiredEntity / us-gaap_BusinessAcquisitionAxis = ttec_GuidonMember |
Valuation Technique on Contingent Consideration | The fair value of the contingent payments was measured based on significant inputs not observable in the market (Level 3 inputs). Key assumptions included in the fair value calculation include a discount rate of 21% and expected future value of payments of $2.8 million. The $2.8 million of expected future payments was calculated using a probability weighted EBITDA assessment with higher probability associated with Guidon achieving the maximum EBITDA targets. |  |  |  |  |  |  |  |
Future Value of Liabilities Incurred From Business Acquisitions |  |  |  |  |  |  |  | 2,800,000ttec_BusinessAcquisitionFutureValueOfLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = ttec_GuidonMember |
Contingent Consideration, at fair value |  |  |  |  |  |  |  | 2,100,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = ttec_GuidonMember |
Discount rate |  |  |  |  |  |  |  | 21.00%us-gaap_FairValueInputsDiscountRate / us-gaap_BusinessAcquisitionAxis = ttec_GuidonMember |
Technology Solutions Group [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Date of Acquisition |  |  | Dec. 31, 2012 |  |  |  |  |  |
Percentage of Voting Interests Acquired |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ttec_TechnologySolutionsGroupMember |  |  |  |  |  |
Description of Acquired Entity |  |  | TSG designs and implements custom communications systems for a variety of business types and sizes. |  |  |  |  |  |
Total Purchase Price |  |  | 44,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ttec_TechnologySolutionsGroupMember |  |  |  |  |  |
Cost of Acquired Entity, Up Front Cash Consideration |  |  | 33,300,000ttec_UpFrontCashConsiderationPaidAcquiredEntity / us-gaap_BusinessAcquisitionAxis = ttec_TechnologySolutionsGroupMember |  |  |  |  |  |
Valuation Technique on Contingent Consideration | The fair value of the contingent payments was measured based on significant inputs not observable in the market (Level 3 inputs). Key assumptions included in the fair value calculation include a discount rate of 4.6% and expected future value of payments of $12.2 million. The $12.2 million of expected future payments was calculated using a bell curve probability weighted EBITDA assessment with the highest probability associated with TSG achieving the targeted EBITDA for each earn-out year. |  |  |  |  |  |  |  |
Future Value of Liabilities Incurred From Business Acquisitions |  |  | 12,200,000ttec_BusinessAcquisitionFutureValueOfLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = ttec_TechnologySolutionsGroupMember |  |  |  |  |  |
Contingent Consideration, at fair value |  |  | $ 11,100,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = ttec_TechnologySolutionsGroupMember |  |  |  |  |  |
Discount rate |  |  | 4.60%us-gaap_FairValueInputsDiscountRate / us-gaap_BusinessAcquisitionAxis = ttec_TechnologySolutionsGroupMember |  |  |  |  |  |
Peppers And Rogers Group Member [Member] | Trade name - indefinite life [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  | 38.00%us-gaap_FairValueInputsDiscountRate / us-gaap_BusinessAcquisitionAxis = ttec_PeppersAndRogersGroupMemberMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Globant [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Nonmonetary Transaction Name Of Counterparty | The Company signed an agreement effective January 31, 2014 to transfer its assets, operations and employees in Argentina to IAFH Global S.A., better known as Globant, a technology service provider based in Argentina. This action placed our assets and employees with a leader focused on developing innovative software products. As part of this agreement, Globant will provide services to TeleTech through their Development Center in Buenos Aires. |  |  |  |  |  |  |  |

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