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ACQUISITIONS AND DIVESTITURES (NARRATIVE) (Details) £ in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
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Apr. 30, 2018 GBP (£) item | Apr. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Nov. 08, 2017 USD ($) | Apr. 03, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Apr. 30, 2018 USD ($) item | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other liabilities, noncurrent |  |  |  |  |  | $ 130,336,000 |  | $ 130,336,000 |  |  | $ 95,243,000
Contingent Consideration, at fair value |  |  |  |  |  | 2,751,000 |  | 2,751,000 |  |  | $ 399,000
Revenue of Acquirees since Acquisition Date, Actual |  |  |  |  |  | 41,300,000 |  | 130,000,000 |  |  |
Income (loss) from operations of Acquirees since Acquisition Date, Actual |  |  |  |  |  | 1,400,000 |  | 10,600,000 |  |  |
Acquired intangible amortization of acquirees since acquisition |  |  |  |  |  | 1,600,000 |  | 4,900,000 |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  | 364,900,000 | $ 371,700,000 | 1,094,100,000 | $ 1,126,200,000 |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax |  |  |  |  |  | 5,400,000 | 17,300,000 | 16,000,000 | $ 53,900,000 |  |
SCS |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity | Strategic Communications ServicesOn April 30, 2018, the Company acquired all of the outstanding equity securities of Strategic Communications Services, Ltd ("SCS"). SCS provides services as a system integrator for multichannel contact center platforms, including CISCO. The Company offers in-house, managed and outsourced network, information, communications and contact center services to leading brands throughout Europe. This business will be integrated into the Company's CTS segment. | Strategic Communications ServicesOn April 30, 2018, the Company acquired all of the outstanding equity securities of Strategic Communications Services, Ltd ("SCS"). SCS provides services as a system integrator for multichannel contact center platforms, including CISCO. The Company offers in-house, managed and outsourced network, information, communications and contact center services to leading brands throughout Europe. This business will be integrated into the Company's CTS segment. |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses | £ 4.4 | $ 6,100,000 |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  |  |  |  |  | $ 9,511,000 |
Future Value of Liabilities Incurred From Business Acquisitions |  |  |  |  |  |  |  |  |  | 2,900,000 |
Contingent Consideration, at fair value |  |  |  |  |  | 2,751,000 |  | 2,751,000 |  | $ 4,100,000 |
SCS | Discount Rate |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input | item | 0.047 |  |  |  |  |  |  |  |  | 0.047 |
SCS | Other accrued expenses |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent Consideration, at Fair Value, Current Portion |  |  |  |  |  | 700,000 |  | 700,000 |  |  |
SCS | Other Noncurrent Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent Consideration, at Fair Value, Current Portion |  |  |  |  |  | $ 2,100,000 |  | 2,100,000 |  |  |
SCS | United Kingdom, Pounds |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent Consideration, at Fair Value, Current Portion | £ | £ 3.0 |  |  |  |  |  |  |  |  |  |
BH |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Date of Acquisition |  |  | Mar. 31, 2018 |  |  |  |  |  |  |  |
Description of Acquired Entity |  |  | Berkshire Hathaway Specialty ConciergeOn March 31, 2018, the Company, through its subsidiary Percepta, acquired certain assets from Berkshire Hathaway Specialty Concierge, LLC ("BH") related to a customer engagement center and the related customer contracts. This acquisition is being accounted for as a business combination. These assets will be integrated into the Company's CMS segment. |  |  |  |  |  |  |  |
Total purchase price |  |  | $ 1 |  |  |  |  |  |  |  |
BH | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair Value of Assets Acquired |  |  | 257,000 |  |  |  |  |  |  |  |
BH | Lease Agreements [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair Value of Assets Acquired |  |  | 330,000 |  |  |  |  |  |  |  |
BH | Fixed Assets |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair Value of Assets Acquired |  |  | 98,000 |  |  |  |  |  |  |  |
Motif [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Date of Acquisition |  |  |  | Nov. 08, 2017 |  |  |  |  |  |  |
Percentage of Voting Interests Acquired |  |  |  | 70.00% |  |  |  |  |  |  |
Description of Acquired Entity |  |  |  | MotifOn November 8, 2017, the Company agreed to acquire all of the outstanding shares in 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 2,700 employees. Motif will be integrated into the Company's CMS segment. |  |  |  |  |  |  |
Payments to Acquire Businesses |  |  |  | $ 46,800,000 |  |  |  |  |  |  |
Total purchase price |  |  |  | $ 73,438,000 |  |  |  |  |  |  |
Other liabilities, noncurrent |  |  | $ 35,800,000 |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 11 years |  |  |  |  |  |  |
Connextions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Date of Acquisition |  |  |  |  | Apr. 03, 2017 |  |  |  |  |  |
Total purchase price |  |  |  |  | $ 77,712,000 |  |  |  |  |  |
Payments for Previous Acquisition |  |  |  |  |  |  | $ 1,800,000 |  |  |  |
Proceeds from Previous Acquisition |  |  |  |  |  |  |  | $ 4,100,000 |  |  |
Cost of Acquired Entity, Up Front Cash Consideration |  |  |  |  | $ 80,000,000 |  |  |  |  |  |
Connextions | Customer Management Services [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Description of Acquired Entity |  |  |  |  | Connextions, Inc., a health care customer service provider company, from OptumHealth Holdings, LLC. Connextions has been integrated into the health care vertical of the CMS segment of the Company. Connextions employed approximately 2,000 at several centers in the U.S. |  |  |  |  |  |
Connextions | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 12 years |  |  |  |  |  |

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