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ACQUISITIONS, DISPOSITIONS AND BUSINESS VENTURE ACTIVITY (Details - Narrative) - USD ($)
12 Months Ended
Sep. 01, 2021
Jan. 01, 2021
Jun. 01, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Aug. 31, 2021
Business Acquisition [Line Items]              
Common stock - par value (in dollars per share)       $ 0.0001 $ 0.0001    
Goodwill acquired       $ 513,820,000 $ 472,879,000 $ 441,973,000  
Proceeds from sale of business       0 0 132,000  
Investment in joint ventures       42,229,000 34,528,000 34,470,000  
Contributions   $ 300,000          
Sale to noncontrolling interests, net of taxes       11,610,000   5,545,000  
Purchase of intangible assets       5,130,000 $ 0 0  
Additional Paid-in Capital              
Business Acquisition [Line Items]              
Sale to noncontrolling interests, net of taxes $ 4,200,000     $ 4,206,000   $ 3,537,000  
Tarzana Medical Center, LLC              
Business Acquisition [Line Items]              
Purchase of intangible assets $ 5,200,000            
Sale | Imaging On Call              
Business Acquisition [Line Items]              
Proceeds from sale of business     $ 1,000        
DeepHealth, Inc.              
Business Acquisition [Line Items]              
Shares issued (in shares)     915,132        
Common stock - par value (in dollars per share)     $ 16.93        
Shares issued at execution (in shares)     823,615        
Shares issued after execution (in shares)     91,517        
Shares issued after acquisition, term     18 months        
Consideration transferred     $ 34,600,000        
Fair value of shares issued at execution     13,900,000        
Fair value of shares issued after execution     1,500,000        
Fair value of replacement awards attributable to pre-combination     2,000,000        
Contingent consideration, fair value     17,000,000        
Business acquisition, closing costs     $ 100,000        
Contingent consideration, milestone one, shares issued (in shares)     390,789        
Contingent consideration, milestone two, shares issued (in shares)     586,184        
Contingent consideration, milestone three, shares issued (in shares)     195,393        
Current assets acquired     $ 100,000        
Deferred tax liabilities acquired     3,500,000        
Intangible assets acquired     14,800,000        
Goodwill acquired     $ 23,300,000        
Simi Valley Imaging Group, LLC              
Business Acquisition [Line Items]              
Investment in joint ventures   400,000          
Simi Adventist              
Business Acquisition [Line Items]              
Investment in joint ventures   $ 100,000          
Simi Valley Imaging Group, LLC              
Business Acquisition [Line Items]              
Economic interest   60.00%          
Simi Valley Imaging Group, LLC | Simi Adventist              
Business Acquisition [Line Items]              
Economic interest   40.00%          
West Valley Imaging Group, LLC | Subsidiaries              
Business Acquisition [Line Items]              
Noncontrolling interest, percent of ownership sold 24.90%            
Proceeds from sale of interest in minority shareholders $ 13,100,000            
Noncontrolling interest, ownership percentage by parent 50.10%           75.00%