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REDEEMABLE NON-CONTROLLING INTEREST (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Installment
Partnership
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Apr. 30, 2018
USD ($)
Business Combination, Description [Abstract]                
Sale of non-controlling interest percentage in partnership     50.00%          
Number of partnerships in which interest acquired | Partnership     7          
Purchase price for additional non controlling interest     $ 6,000          
Cash paid for aggregate purchase price     $ 5,700          
Seller notes           $ 283 $ 0 $ 950
Business acquisition number of installments for payment of purchase consideration | Installment     2          
Excess of purchase price of non controlling interest     $ 400          
Excess of purchase of non controlling interest, net of tax     $ 100          
Number of partnerships in which various interest sold | Partnership     3          
Sale price of non controlling interest in partnership     $ 2,870 $ 0        
Changes in Carrying Amount of Redeemable Non-Controlling Interests [Roll Forward]                
Beginning balance     133,943          
Ending balance $ 139,801   139,801   $ 133,943      
Carrying Amount (Fair Value) of Redeemable Non-Controlling Interest [Abstract]                
Fair value 139,801   139,801   133,943 139,801    
Redeemable Non-Controlling Interest [Member]                
Changes in Carrying Amount of Redeemable Non-Controlling Interests [Roll Forward]                
Beginning balance 133,366 $ 117,027 133,943 102,572 102,572      
Operating results allocated to redeemable non-controlling interest partners 2,379 2,456 8,152 6,802        
Distributions to redeemable non-controlling interest partners (1,636) (2,497) (6,799) (6,576)        
Changes in the fair value of redeemable non-controlling interest 922 8,681 10,752 18,106        
Purchases of redeemable non-controlling interest (1,459) 0 (6,344) 0        
Reduction of non-controlling interest due to sale of USPh partnership interest 0 0 (6,132) 0        
Acquired interest 6,230 3,282 6,230 8,145        
Sales of redeemable non-controlling interest - temporary equity 0 0 2,870 0        
Notes receivable related to sales of redeemable non-controlling interest - temporary equity 0 0 (2,870) 0        
Other (1) (43) (1) (143)        
Ending balance 139,801 128,906 139,801 128,906 133,943      
Carrying Amount (Fair Value) of Redeemable Non-Controlling Interest [Abstract]                
Contractual time period has lapsed but holder's employment has not been terminated           40,958 34,587  
Contractual time period has not lapsed and holder's employment has not been terminated           98,843 94,319  
Holder's employment has terminated and contractual time period has expired           0 0  
Holder's employment has terminated and contractual time period has not expired           0 0  
Fair value $ 133,366 $ 117,027 $ 133,943 $ 102,572 $ 102,572 $ 139,801 $ 128,906  
Therapy Practice [Member] | Minimum [Member]                
Business Combination, Description [Abstract]                
Business acquisition, percentage of limited partnership acquired           50.00%    
Therapy Practice [Member] | Maximum [Member]                
Business Combination, Description [Abstract]                
Business acquisition, percentage of limited partnership acquired           90.00%    
Therapy Practice [Member] | NewCo. [Member]                
Business Combination, Description [Abstract]                
Percentage of equity interest of subsidiary contributed for acquisition           100.00%    
Business acquisition, percentage of general partnership interest acquired           100.00%    
Business acquisition, consideration payable, term of note     2 years          
Employment agreement renewal term     1 year          
Non-Compete agreement term under condition of termination of employment of employed selling shareholder     2 years          
Therapy Practice [Member] | NewCo. [Member] | Minimum [Member]                
Business Combination, Description [Abstract]                
Employment agreement term     3 years          
Non-Compete agreement term regardless of whether the selling shareholder is employed     5 years          
Therapy Practice [Member] | NewCo. [Member] | Maximum [Member]                
Business Combination, Description [Abstract]                
Employment agreement term     5 years          
Non-Compete agreement term regardless of whether the selling shareholder is employed     6 years