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INCOME TAXES (NARRATIVE) (DETAILS) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
INCOME TAXES [ABSTRACT]    
Total deferred tax assets, net of valuation allowance $ 52,800,000us-gaap_DeferredTaxAssetsNet  
Valuation allowance on deferred tax assets 10,400,000us-gaap_DeferredTaxAssetsValuationAllowance  
Deferred tax assets, net of valuation allowance and deferred tax liabilities 49,900,000us-gaap_DeferredTaxAssetsLiabilitiesNet  
Effective income tax rate 18.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 11.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Canada [Member]    
Significant Change in Unrecognized Tax Benefits Is Reasonably Possible [LineItems]    
Significant Change in Unrecognized Tax Benefits, Nature of Event During the first quarter of 2014, a benefit of $1.2 million was recorded due to the closing of statutes of limitations in Canada.  
Tax Adjustments, Settlements, and Unusual Provisions   1,200,000us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions
/ us-gaap_IncomeTaxAuthorityAxis
= ttec_CanadaMember
Income Tax Examination [Line Items]    
Income Tax Years under Audit 2009 and 2010  
United States [Member]    
Income Tax Examination [Line Items]    
Income Tax Years under Audit 2011 to present  
Technology Solutions Group [Member]    
Income Tax Examination [Line Items]    
Income Tax Years under Audit 2012