EQUITY-METHOD INVESTMENTS - Condensed Financial Information of Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Consolidated statements of comprehensive income (loss) data:
Equity in net income	$ 800	$ 300	$ 2,018	$ 656
Legacy Health Systems
Consolidated statements of comprehensive income (loss) data:
Net revenue	5,814	5,572	15,210	15,728
Cost of revenue	4,083	3,853	10,882	11,132
Gross profit	1,731	1,719	4,328	4,596
Net income	670	402	1,177	1,225
Equity in net income	335	201	588	612
Consolidated balance sheet data:
Current assets	6,358		6,358		$ 5,666
Noncurrent assets	4,072		4,072		3,403
Current liabilities	572		572		119
Noncurrent liabilities	740		740		8
Vanderbilt Health Services
Consolidated statements of comprehensive income (loss) data:
Net revenue	9,638	7,659	28,701	22,055
Cost of revenue	7,473	5,718	21,989	16,943
Gross profit	2,165	1,941	6,712	5,112
Net income	982	199	2,859	88
Equity in net income	491	$ 100	1,430	$ 44
Consolidated balance sheet data:
Current assets	10,095		10,095		6,517
Noncurrent assets	2,206		2,206		1,008
Current liabilities	1,116		1,116		192
Noncurrent liabilities	$ 1,061		$ 1,061		$ 68