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REVENUE RECOGNITION (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Percentage of net revenues	100.00%	100.00%	100.00%	100.00%
DIS business
Segment Reporting Information [Line Items]
Percentage of net revenues	96.00%	96.00%	96.00%	96.00%
DIS business | Healthcare Insurers
Segment Reporting Information [Line Items]
Percentage of net revenues	35.00%	36.00%	36.00%	36.00%
DIS business | Healthcare Insurers | Fee-for-service
Segment Reporting Information [Line Items]
Percentage of net revenues	32.00%	32.00%	33.00%	32.00%
DIS business | Healthcare Insurers | Capitated
Segment Reporting Information [Line Items]
Percentage of net revenues	3.00%	4.00%	3.00%	4.00%
DIS business | Government Payers
Segment Reporting Information [Line Items]
Percentage of net revenues	15.00%	16.00%	15.00%	16.00%
DIS business | Client Payers
Segment Reporting Information [Line Items]
Percentage of net revenues	32.00%	31.00%	32.00%	31.00%
DIS business | Patients
Segment Reporting Information [Line Items]
Percentage of net revenues	14.00%	13.00%	13.00%	13.00%
DIS business | Minimum
Segment Reporting Information [Line Items]
Percentage of net revenues			95.00%	95.00%
All other operating segments | DS Businesses
Segment Reporting Information [Line Items]
Percentage of net revenues	4.00%	4.00%	4.00%	4.00%

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