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REVENUE RECOGNITION (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Percentage of net revenues 100.00% 100.00% 100.00% 100.00%
Healthcare Insurers [Member] | Minimum [Member]        
Segment Reporting Information [Line Items]        
Collection of consideration     30 days  
Healthcare Insurers [Member] | Maximum [Member]        
Segment Reporting Information [Line Items]        
Collection of consideration     60 days  
Government Payers [Member]        
Segment Reporting Information [Line Items]        
Collection of consideration     30 days  
Client Payers [Member] | Minimum [Member]        
Segment Reporting Information [Line Items]        
Collection of consideration     60 days  
Client Payers [Member] | Maximum [Member]        
Segment Reporting Information [Line Items]        
Collection of consideration     90 days  
Patient [Member] | Minimum [Member]        
Segment Reporting Information [Line Items]        
Collection of consideration     30 days  
Patient [Member] | Maximum [Member]        
Segment Reporting Information [Line Items]        
Collection of consideration     60 days  
DS Businesses [Member] | Minimum [Member]        
Segment Reporting Information [Line Items]        
Collection of consideration     30 days  
DS Businesses [Member] | Maximum [Member]        
Segment Reporting Information [Line Items]        
Collection of consideration     60 days  
DIS business [Member]        
Segment Reporting Information [Line Items]        
Percentage of net revenues 96.00% 96.00% 96.00% 95.40%
DIS business [Member] | Healthcare Insurers [Member]        
Segment Reporting Information [Line Items]        
Percentage of net revenues 35.00% 38.00% 36.00% 37.00%
DIS business [Member] | Healthcare Insurers [Member] | Fee-for-service [Member]        
Segment Reporting Information [Line Items]        
Percentage of net revenues 32.00% 34.00% 32.00% 33.00%
DIS business [Member] | Healthcare Insurers [Member] | Capitated [Member]        
Segment Reporting Information [Line Items]        
Percentage of net revenues 3.00% 4.00% 4.00% 4.00%
DIS business [Member] | Government Payers [Member]        
Segment Reporting Information [Line Items]        
Percentage of net revenues 16.00% 17.00% 16.00% 16.00%
DIS business [Member] | Client Payers [Member]        
Segment Reporting Information [Line Items]        
Percentage of net revenues 32.00% 30.00% 31.00% 30.00%
DIS business [Member] | Patient [Member]        
Segment Reporting Information [Line Items]        
Period of billing fully reserve     210 days  
Percentage of net revenues 13.00% 11.00% 13.00% 12.00%
All other operating segments [Member] | DS Businesses [Member]        
Segment Reporting Information [Line Items]        
Percentage of net revenues 4.00% 4.00% 4.00% 5.00%