EQUITY-METHOD INVESTMENTS - Condensed Financial Information of Equity Method Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated statements of comprehensive income (loss) data:
Equity in net income	$ 2,840	$ 1,020	$ 2,186
Legacy Health Systems
Consolidated statements of comprehensive income (loss) data:
Net revenue	21,037	21,309	23,295
Cost of revenue	14,792	15,042	17,069
Gross profit	6,245	6,267	6,226
Net income	1,986	1,772	3,278
Equity in net income	993	886	1,639
Consolidated balance sheet data:
Current assets	7,643	5,666
Noncurrent assets	3,846	3,403
Current liabilities	903	119
Noncurrent liabilities	659	8
Vanderbilt Health Services
Consolidated statements of comprehensive income (loss) data:
Net revenue	38,744	31,517	27,805
Cost of revenue	29,952	24,433	20,665
Gross profit	8,792	7,084	7,140
Net income	3,694	268	1,094
Equity in net income	1,847	134	$ 547
Consolidated balance sheet data:
Current assets	11,111	6,517
Noncurrent assets	2,033	1,008
Current liabilities	1,228	192
Noncurrent liabilities	$ 956	$ 68