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EQUITY-METHOD INVESTMENTS - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
investment
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
investment
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2005
USD ($)
Schedule of Equity Method Investments [Line Items]              
Number of equity method investments | investment 2   2        
Investments in equity-method investees $ 16,100,000   $ 16,100,000   $ 14,600,000    
Proportionate share of earnings in equity-method investees 800,000 $ 300,000 2,018,000 $ 656,000      
Legacy Health Systems              
Schedule of Equity Method Investments [Line Items]              
Proportionate share of earnings in equity-method investees $ 335,000 201,000 $ 588,000 612,000      
Ownership interest 50.00%   50.00%        
Initial investment             $ 1,300,000
Capital distribution received from investment $ 500,000 0 $ 500,000 0      
Vanderbilt Health Services              
Schedule of Equity Method Investments [Line Items]              
Proportionate share of earnings in equity-method investees $ 491,000 $ 100,000 $ 1,430,000 $ 44,000      
Ownership interest 50.00%   50.00%        
Initial investment           $ 1,100,000