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BASIS OF PRESENTATION - Description of Business and Basis of Presentation (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2024
hospital
Mar. 31, 2024
healthcare_facility
Dec. 31, 2023
segment
Dec. 31, 2022
segment
Business Acquisition [Line Items]        
Number of reportable segments | segment     2 3
Hospital Operations        
Business Acquisition [Line Items]        
Number of acute care and specialty hospitals operated 52      
Number of outpatient facilities operated | healthcare_facility   151    
United Surgical Partners International | Ambulatory Care        
Business Acquisition [Line Items]        
Number of ambulatory surgery centers 512      
Number of surgical hospitals operated by subsidiaries 25      
Number of outpatient centers recorded using equity method 157 157