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REVENUE RECOGNITION AND ALLOWANCE FOR CREDIT LOSSES (Details)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Percentage of net revenues	100.00%	100.00%
Net accounts receivable	100.00%		100.00%
DIS business
Segment Reporting Information [Line Items]
Percentage of net revenues	97.00%	96.00%
Net accounts receivable	96.00%		97.00%
DIS business | Healthcare Insurers
Segment Reporting Information [Line Items]
Percentage of net revenues	40.00%	37.00%
Net accounts receivable	33.00%		34.00%
DIS business | Healthcare Insurers | Fee-for-service
Segment Reporting Information [Line Items]
Percentage of net revenues	38.00%	34.00%
DIS business | Healthcare Insurers | Capitated
Segment Reporting Information [Line Items]
Percentage of net revenues	2.00%	3.00%
DIS business | Government Payers
Segment Reporting Information [Line Items]
Percentage of net revenues	10.00%	14.00%
Net accounts receivable	7.00%		6.00%
DIS business | Client Payers
Segment Reporting Information [Line Items]
Percentage of net revenues	35.00%	33.00%
Net accounts receivable	43.00%		46.00%
DIS business | Patients
Segment Reporting Information [Line Items]
Percentage of net revenues	12.00%	12.00%
Net accounts receivable	13.00%		11.00%
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	3.00%	4.00%
Net accounts receivable	4.00%		3.00%

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