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NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2024
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
center
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
center
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Business Acquisition [Line Items]            
Number of centers | center   399   399    
BRMG and NY Groups revenues   $ 55,300 $ 51,300 $ 162,500 $ 151,500  
BRMG and NY Groups operating expenses   55,300 51,300 162,500 151,500  
Management services provided to BRMG and NY Groups   207,400 $ 214,700 673,300 $ 638,300  
BRMG and NY Groups accounts receivable   3,275,342   3,275,342   $ 2,690,473
BRMG and NY Groups accounts payable   2,155,708   2,155,708   1,877,114
Variable Interest Entity, Primary Beneficiary            
Business Acquisition [Line Items]            
BRMG and NY Groups accounts receivable   118,000   118,000   94,100
BRMG and NY Groups accounts payable   $ 21,700   $ 21,700   $ 16,700
Common Stock | Public Offering            
Business Acquisition [Line Items]            
Number of shares issued in transaction (in shares) | shares 5,232,500          
Stock price (in dollars per share) | $ / shares $ 44.00          
Gross proceeds $ 230,200          
Public offering expenses $ 11,800          
Common Stock | Public Offering | Sold Pursuant to Exercise            
Business Acquisition [Line Items]            
Number of shares issued in transaction (in shares) | shares 682,500