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
	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	$ 25,700,000
Contingent Consideration, at fair value			16,990,000
Contingent consideration payments during period	(9,144,000)	(1,100,000)
Revenue of Acquirees since Acquisition Date, Actual	91,900,000	69,100,000	8,900,000
Income (loss) from operations of Acquirees since Acquisition Date, Actual	7,700,000	10,000,000	1,400,000
Business Combination Pro Forma Information Amortization Expense Of Acquirees Since Acquisition	6,300,000	4,200,000	400,000
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				34,265,000
Cost of Acquired Entity, Up Front Cash Consideration				18,000,000
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				15,300,000
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				14,500,000
Discount rate				4.60%
Measurement period adjustment - Other accrued expenses	6,400,000
Measurement period adjustment - Other noncurrent liabilities	8,800,000
Acquisiton hold-back payment				1,800,000
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%
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					14,172,000
Cost of Acquired Entity, Up Front Cash Consideration					9,400,000
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					4,000,000
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%
Measurement period adjustment - Other accrued expenses	2,800,000
Measurement period adjustment - Other noncurrent liabilities	3,500,000
Acquisiton hold-back payment					1,000,000
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%
Total Purchase Price						17,800,000
Cost of Acquired Entity, Up Front Cash Consideration						15,300,000
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						2,600,000
Contingent Consideration, at fair value						2,500,000
Discount rate						5.30%
Iknowtion [Member]
Business Acquisition [Line Items]
Date of Acquisition							Feb. 27, 2012
Percentage of Voting Interests Acquired							80.00%
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							1,200,000
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							4,300,000
Contingent Consideration, at fair value							2,900,000
Discount rate							21.00%
Measurement period adjustment - Other accrued expenses	1,800,000
Measurement period adjustment - Other noncurrent liabilities	500,000
Guidon [Member]
Business Acquisition [Line Items]
Date of Acquisition								Oct. 04, 2012
Percentage of Voting Interests Acquired								100.00%
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								5,700,000
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								2,800,000
Contingent Consideration, at fair value								2,100,000
Discount rate								21.00%
Technology Solutions Group [Member]
Business Acquisition [Line Items]
Date of Acquisition			Dec. 31, 2012
Percentage of Voting Interests Acquired			100.00%
Description of Acquired Entity			TSG designs and implements custom communications systems for a variety of business types and sizes.
Total Purchase Price			44,500,000
Cost of Acquired Entity, Up Front Cash Consideration			33,300,000
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			12,200,000
Contingent Consideration, at fair value			$ 11,100,000
Discount rate			4.60%
Peppers And Rogers Group Member [Member] | Trade name - indefinite life [Member]
Business Acquisition [Line Items]
Discount rate									38.00%
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.