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ACQUISITIONS AND DIVESTITURES (NARRATIVE) (DETAILS) CAD in Millions |  |  |  |  | 3 Months Ended | 7 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 08, 2017 USD ($) | Sep. 30, 2017 USD ($) | Apr. 03, 2017 USD ($) | Nov. 09, 2016 CAD | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Aug. 08, 2014 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Nov. 09, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Acquired Entity, Up Front Cash Consideration |  |  | $ 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Consideration, at fair value |  | $ 1,178,000 |  |  | $ 1,178,000 |  |  | $ 1,808,000 |  |  |  |  |  | $ 1,178,000 |  |
Revenue of Acquirees since Acquisition Date, Actual |  |  |  |  | 43,600,000 |  |  |  |  |  |  |  |  | 101,900,000 |  |
Income (loss) from operations of Acquirees since Acquisition Date, Actual |  |  |  |  | (4,100,000) |  |  |  |  |  |  |  |  | (6,300,000) |  |
Proceeds from sale of business |  |  |  |  |  |  |  |  |  |  |  |  |  | 391,000 |  |
Gain on sale of business |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,323,000 |  |
Other nonoperating income expense |  |  |  |  | (4,416,000) |  |  |  | $ (6,254,000) |  |  |  |  | (6,573,000) | $ (7,488,000) |
Business Combination Pro Forma Information Amortization Expense of Acquirees Since Acquisition |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  | 2,100,000 |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  | 359,000,000 |  |  |  | 362,300,000 |  |  |  |  | 1,090,000,000 | 1,071,700,000 |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax |  |  |  |  | 14,800,000 |  |  |  | 9,400,000 |  |  |  |  | 46,900,000 | 27,800,000 |
Investments in non-marketable equity investments |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,384,000 |  |
Technology Solutions Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  |  | 141,000 | $ 250,000 |  |  |  |  |  |  |  |  |  |
Gain on sale of business |  |  |  |  |  | $ 30,000 |  |  |  |  |  |  |  |  |  |
TeleTech Spain Holdings SL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other nonoperating income expense |  |  |  |  | 3,200,000 |  |  |  |  |  |  |  |  |  |  |
Connextions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  | $ 77,712,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Previous Acquisition |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Previous Acquisition |  |  |  |  | 4,100,000 |  |  |  |  |  |  |  |  |  |  |
Connextions [Member] | Customer Management Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity |  |  | Connextions, Inc., a health care customer service provider company, from OptumHealth Holdings, LLC. Connextions is being integrated into the health care vertical of the Customer Management Services ("CMS") segment of the Company. Connextions employed approximately 2,000 at several centers in the U.S. |  |  |  |  |  |  |  |  |  |  |  |  |
Connextions [Member] | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |
Atelka [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity |  |  |  | On November 9, 2016, the Company acquired all of the outstanding shares of Atelka Enterprise Inc. ("Atelka"), a Canadian customer contact center management and business process outsourcing services company that serves Canadian telecommunications, logistics, and entertainment clients. This acquisition was an addition to the CMS segment. Atelka employed approximately 2,800 in Quebec, Ontario, New Brunswick and Prince Edward Island. |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 48,401,000
Cost of Acquired Entity, Up Front Cash Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,500,000
Acquisition hold-back payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000
Discount rate |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Consideration, at fair value |  | $ 602,000 |  |  | 602,000 |  |  | 558,000 |  |  |  |  |  | $ 602,000 |  |
Atelka [Member] | CAD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price | CAD |  |  |  | CAD 65.0 |  |  |  |  |  |  |  |  |  |  |  |
Atelka [Member] | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |
rogenSi [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity |  |  |  |  |  |  |  |  |  |  |  |  | rogenSi Worldwide PTY, Ltd., a global leadership, change management, sales, performance training and consulting company. |  |  |
Total purchase price |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,400,000 |  |  |
Cost of Acquired Entity, Up Front Cash Consideration |  |  |  |  |  |  |  |  |  |  |  |  | 18,100,000 |  |  |
Future Value of Liabilities Incurred From Business Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,300,000 |  |  |
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 |  |  |
Acquisition hold-back payment |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.60% |  |  |
Contingent Consideration Arrangements, Basis for Amount |  |  |  |  |  |  |  |  |  |  |  |  | The total contingent consideration possible per the sale and purchase agreement ranged from zero to $17.6 million and the earn-out payments were payable in early 2015, 2016 and 2017, based on July 1, 2014 through December 31, 2014, and full year 2015 and 2016 performance, respectively. As of December 31, 2016, the contingent consideration has been finalized and a total of $12.0 million was earned and paid |  |  |
Contingent Consideration, at fair value |  |  |  |  |  |  |  |  | 4,300,000 |  |  |  | $ 14,500,000 |  | $ 4,300,000 |
Contingent Consideration, at Fair Value, Current Portion |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Increase (decrease) in contingent consideration payable |  |  |  |  | $ (4,300,000) |  |  |  | $ 800,000 | $ (300,000) |  | $ 500,000 |  |  |  |
CafeX [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 17.20% |  |  | 17.20% |  |  |  |  | 17.20% |  |  |  | 17.20% |  |
Investments in non-marketable equity investments |  |  |  |  |  |  | $ 1,100,000 | $ 3,200,000 |  |  | $ 9,000,000 |  |  |  |  |
Motif [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Voting Interests Acquired | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity | Motif, Inc., a California corporation ("Motif"). Motif is a digital trust and safety services company serving eCommerce marketplaces, online retailers, travel agencies and financial services companies. Motif provides omni-channel community moderation services via voice, email and chat from delivery centers in India and the Philippines via approximately 2,800 employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price | $ 46,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Consideration Arrangements, Basis for Amount | The Company also agreed to purchase the remaining 30% interest in Motif from Motif's founders ("founders' shares") by no later than May 2020 ("30% buyout period"). The Company agreed to pay for the founders' shares at a purchase price contingent on Motif's fiscal year 2020's adjusted normalized EBITDA, and 30% of the excess cash present in the business at the time of the buyout; or if the buyout occurs prior to May 2020, the trailing twelve months EBITDA, calculated from the most recently completed full monthly period ending prior to the date of the buyout triggering event and 30% of the excess cash in the business at that point. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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