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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]      
Service fee revenue $ 1,616,630 $ 1,430,061 $ 1,315,077
Deferred financing costs, net of accumulated amortization $ 1,600 2,300  
Minimum | Propery and equipment, net      
Property, Plant and Equipment [Line Items]      
PP&E useful life 3 years    
Minimum | Leasehold improvements      
Property, Plant and Equipment [Line Items]      
PP&E useful life 3 years    
Maximum | Propery and equipment, net      
Property, Plant and Equipment [Line Items]      
PP&E useful life 15 years    
Maximum | Leasehold improvements      
Property, Plant and Equipment [Line Items]      
PP&E useful life 15 years    
Patient Services, Net [Member] | eRAD      
Property, Plant and Equipment [Line Items]      
Service fee revenue $ 20,200 $ 13,200 $ 10,500