EQUITY-METHOD INVESTMENTS - Condensed Financial Information of Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Consolidated statements of comprehensive income (loss) data:
Equity in net income	$ 562	$ 549
Legacy Health Systems
Consolidated statements of comprehensive income (loss) data:
Net revenue	5,491	4,775
Cost of revenue	3,940	3,367
Gross profit	1,551	1,408
Net income	517	250
Equity in net income	258	125
Consolidated balance sheet data:
Current assets	7,482		$ 7,643
Noncurrent assets	3,615		3,846
Current liabilities	1,074		903
Noncurrent liabilities	579		659
Vanderbilt Health Services
Consolidated statements of comprehensive income (loss) data:
Net revenue	10,508	9,238
Cost of revenue	8,640	7,049
Gross profit	1,868	2,189
Net income	608	847
Equity in net income	304	$ 424
Consolidated balance sheet data:
Current assets	12,086		11,111
Noncurrent assets	1,862		2,033
Current liabilities	1,528		1,228
Noncurrent liabilities	$ 852		$ 956