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INCOME TAXES (NARRATIVE) (DETAILS) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2011
Deferred Tax Asset Net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total deferred tax assets, net |  |  | $ 65,630,000us-gaap_DeferredTaxAssetsNet |  |  |  | $ 78,654,000us-gaap_DeferredTaxAssetsNet | $ 65,630,000us-gaap_DeferredTaxAssetsNet |  |  |  |  |  |  |
Valuation allowances |  |  | 10,792,000us-gaap_DeferredTaxAssetsValuationAllowance |  |  |  | 10,721,000us-gaap_DeferredTaxAssetsValuationAllowance | 10,792,000us-gaap_DeferredTaxAssetsValuationAllowance | 20,909,000us-gaap_DeferredTaxAssetsValuationAllowance |  |  |  |  |  | 16,555,000us-gaap_DeferredTaxAssetsValuationAllowance
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Change in Valuation Allowance | 200,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 600,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 2,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 400,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 300,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 900,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | (100,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |  |  |  |  |  |  |
Tax Credit Carry Forward [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Amount Foregin Earnings Invested Outside United States |  |  |  |  |  |  | 445,000,000ttec_CumulativeAmountForeginEarningsInvestedOutsideUnitedStates |  |  |  |  |  |  |  |
Income Tax Holidays Description |  |  |  |  |  |  | The Company has been granted “Tax Holidays” as an incentive to attract foreign investment by the governments of the Philippines and Costa Rica. Generally, a Tax Holiday is an agreement between the Company and a foreign government under which the Company receives certain tax benefits in that country, such as exemption from taxation on profits derived from export-related activities. In the Philippines, the Company has been granted multiple agreements with an initial period of four years and additional periods for varying years, expiring at various times between 2011 and 2020. |  |  |  |  |  |  |  |
Income Tax Holiday Termination Date |  |  |  |  |  |  | 2011 and 2020 |  |  |  |  |  |  |  |
Aggregate Effect on Income Tax Expense for Income Tax Holiday Jurisdictions |  |  |  |  |  |  | 20,200,000us-gaap_IncomeTaxHolidayAggregateDollarAmount | 14,600,000us-gaap_IncomeTaxHolidayAggregateDollarAmount | 20,100,000us-gaap_IncomeTaxHolidayAggregateDollarAmount |  |  |  |  |  |
Diluted Net Income Per Share Effect For Income Tax Holiday Jurisdictions |  |  |  |  |  |  | $ 0.27us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare | $ 0.28us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare | $ 0.36us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare |  |  |  |  |  |
Total Interest and Penalties Related to Uncertain Tax Positions Recorded in Statements of Comprehensive Income |  |  |  |  |  |  | 132,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 77,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 40,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense |  |  |  |  |  |
Total Interest and Penalties Accrued Related to Uncertain Tax Positions Recorded in Balance Sheets |  |  | 77,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |  |  | 132,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 77,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |  |  |  |  |  |
Reserve for Uncertain Tax Benefits, Net |  |  |  |  |  |  | 1,900,000ttec_ReserveRecognizedForUncertainTaxBenefits | 500,000ttec_ReserveRecognizedForUncertainTaxBenefits |  |  |  |  |  |  |
Decrease of Unrecognized Tax Benefits over Next 12 Months |  |  |  |  |  |  | 1,900,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit |  |  |  |  |  |  |  |
Federal [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carry Forward [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carry Forward Amount |  |  |  |  |  |  |  |  |  | 900,000us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = ttec_FederalMember | 2,300,000us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = ttec_FederalMember | 2,200,000us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = ttec_FederalMember | 3,700,000us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = ttec_FederalMember | 3,500,000us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = ttec_FederalMember |
Tax Credit Carry Forward Expiration Date |  |  |  |  |  |  |  |  |  | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 |
State [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carry Forward [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carry Forward Amount |  |  |  |  |  |  |  |  |  |  | 1,800,000us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = ttec_StateMember |  |  |  |
Tax Credit Carry Forward Expiration Date |  |  |  |  |  |  | Dec. 31, 2014 |  |  |  | Dec. 31, 2023 |  |  |  |
State Tax Credits and NOL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Change in Valuation Allowance |  |  |  |  |  |  | 500,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ttec_StateTaxCreditsAndNolMember |  |  |  |  |  |  |  |
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Asset Net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total deferred tax assets, net |  |  |  |  |  |  | 32,300,000us-gaap_DeferredTaxAssetsNet / us-gaap_IncomeTaxAuthorityAxis = ttec_UnitedStatesMember |  |  |  |  |  |  |  |
Significant Change In Unrecognized Tax Benefits From Significant Tax Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax examination years under audit |  |  |  |  |  |  | 2009, 2011 and 2012 |  |  |  |  |  |  |  |
Foreign Jurisdictions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Asset Net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total deferred tax assets, net |  |  |  |  |  |  | 17,000,000us-gaap_DeferredTaxAssetsNet / us-gaap_IncomeTaxAuthorityAxis = ttec_ForeignJurisdictionsMember |  |  |  |  |  |  |  |
Foreign Jurisdictions [Member] | Not Realizable Standard [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Change in Valuation Allowance |  |  |  |  |  |  | (300,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_IncomeTaxAuthorityAxis = ttec_ForeignJurisdictionsMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ttec_NotRealizableStandardMember |  |  |  |  |  |  |  |
Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Change In Unrecognized Tax Benefits From Significant Tax Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions |  | 1,200,000us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions / us-gaap_IncomeTaxAuthorityAxis = ttec_CanadaMember |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax examination years under audit |  | 2009 and 2010 |  |  |  |  |  |  |  |  |  |  |  |  |
Argentina [Member] | Not Realizable Standard [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Change in Valuation Allowance |  |  |  |  |  |  | 200,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_IncomeTaxAuthorityAxis = ttec_ArgentinaMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ttec_NotRealizableStandardMember |  |  |  |  |  |  |  |
Philippines [Member] | Other Increase Decrease [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Change in Valuation Allowance |  |  |  |  |  |  | (700,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_IncomeTaxAuthorityAxis = ttec_PhilippinesMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ttec_OtherIncreaseDecreaseMember |  |  |  |  |  |  |  |
Ghana [Member] | Not Realizable Standard [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Change in Valuation Allowance |  |  |  |  |  |  | 200,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_IncomeTaxAuthorityAxis = ttec_GhanaMember / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = ttec_NotRealizableStandardMember |  |  |  |  |  |  |  |
Netherlands [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Change In Unrecognized Tax Benefits From Significant Tax Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions | $ 1,300,000us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions / us-gaap_IncomeTaxAuthorityAxis = ttec_NetherlandsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax examination years under audit | 2010 and 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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