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NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jun. 30, 2023
shares
Mar. 31, 2024
USD ($)
center
$ / shares
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Business Acquisition [Line Items]        
Number of centers | center   375    
BRMG and NY Groups revenues   $ 52,300 $ 48,800  
BRMG and NY Groups operating expenses   52,300 48,800  
Management services provided to BRMG and NY Groups   234,800 $ 207,400  
BRMG and NY Groups accounts receivable   2,969,555   $ 2,690,473
BRMG and NY Groups accounts payable   1,892,230   1,877,114
Variable Interest Entity, Primary Beneficiary        
Business Acquisition [Line Items]        
BRMG and NY Groups accounts receivable   108,900   94,100
BRMG and NY Groups accounts payable   $ 16,000   $ 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