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ACQUISITIONS (NARRATIVE) (DETAILS) - USD ($)
$ in Thousands
 2 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended
Feb. 28, 2014
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Aug. 08, 2014
Dec. 31, 2014
Business Acquisition [Line Items]            
Future Value of Liabilities Incurred From Business Acquisitions   $ 13,100   $ 13,100    
Valuation Technique on Contingent Consideration       Contingent Consideration — The Company recorded contingent consideration related to the acquisitions of iKnowtion, Guidon, TSG, WebMetro, Sofica and rogenSi. These contingent payables were recognized at fair value using a discounted cash flow approach and a discount rate of 21.0%, 21.0%, 4.6%, 5.3%, 5.0% or 4.6%, respectively. The discount rates vary dependant on the specific risks of each acquisition including the country of operation, the nature of services and complexity of the acquired business, and other similar factors. These measurements were based on significant inputs not observable in the market. The Company will record interest expense each period using the effective interest method until the future value of these contingent payables reaches their expected future value of $13.1 million. Interest expense related to all recorded contingent payables is included in Interest expense in the Consolidated Statements of Comprehensive Income (Loss).    
Contingent Consideration, at fair value   12,611   $ 12,611   $ 24,744
Revenue of Acquirees since Acquisition Date, Actual   14,700   27,300    
Income (loss) from operations of Acquirees since Acquisition Date, Actual   2,100   3,200    
Business Combination Pro Forma Information Amortization Expense of Acquirees Since Acquisition   700   1,400    
Sofica [Member]            
Business Acquisition [Line Items]            
Date of Acquisition Feb. 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.          
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net $ 14,200          
Cost of Acquired Entity, Up Front Cash Consideration 9,400          
Future Value of Liabilities Incurred From Business Acquisitions $ 3,800          
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.          
Acquisition hold-back payment $ 1,000          
Discount rate 5.00%          
Contingent Consideration Arrangements, Basis for Amount 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.          
Contingent Consideration, at fair value $ 4,000          
Contingent Consideration, at Fair Value, Current Portion   3,100   3,100    
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.  
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net         $ 34,403  
Cost of Acquired Entity, Up Front Cash Consideration         18,100  
Future Value of Liabilities Incurred From Business Acquisitions         $ 15,300  
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  
Discount rate         4.60%  
Contingent Consideration Arrangements, Basis for Amount         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  
Contingent Consideration, at Fair Value, Current Portion   5,000   5,000    
Contingent Consideration, at Fair Value, Noncurrent Portion   $ 4,000   $ 4,000    
CafeX [Member]            
Business Acquisition [Line Items]            
Cost Method Investments Description    

the Company invested $9.0 million in CafeX Communications, Inc. (“CafeX”) through the purchase of a portion of the Series B Preferred Stock of CafeX. After the transaction, the Company owns 17.3% of the total equity of CafeX.