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MANDATORILY REDEEMABLE NON-CONTROLLING INTERESTS (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Changes in Carrying Amount of Redeemable Non-Controlling Interest [Roll Forward]    
Beginning balance $ 69,190  
Operating results allocated to mandatorily redeemable non-controlling interest partners 3,081  
Distributions to mandatorily redeemable non-controlling interest partners (3,272)  
Changes in the redemption value of mandatorily redeemable non-controlling interest 6,592  
Payments for settlement of mandatorily redeemable non-controlling interest (2,230)  
Purchases of businesses - initial liability related to mandatorily redeemable non-controlling interests 10,282  
Ending balance 83,643  
Carrying Amount of Redeemable Non-Controlling Interest [Abstract]    
Contractual time period has lapsed but holder's employment has not been terminated   $ 30,838
Contractual time period has not lapsed and holder's employment has not been terminated   55,454
Holder's employment has terminated and contractual time period has expired   0
Holder's employment has terminated and contractual time period has not expired   0
Redemption value prior to excess distributed earnings   86,292
Excess distributions over earnings and losses   (2,649)
Redeemable non-controlling interests $ 69,190 $ 83,643
Therapy Practice [Member] | Minimum [Member]    
Business Acquisition [Line Items]    
Business acquisition, percentage of limited partnership acquired   50.00%
Therapy Practice [Member] | Maximum [Member]    
Business Acquisition [Line Items]    
Business acquisition, percentage of limited partnership acquired   90.00%
Therapy Practice [Member] | NewCo. [Member]    
Business Acquisition [Line Items]    
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 Acquisition [Line Items]    
Employment agreement term 3 years  
Non-Compete agreement term regardless of whether the selling shareholder is employed 5 years  
Required redemption term, under condition of termination of employment of employed selling shareholders 3 years  
Therapy Practice [Member] | NewCo. [Member] | Maximum [Member]    
Business Acquisition [Line Items]    
Employment agreement term 5 years  
Non-Compete agreement term regardless of whether the selling shareholder is employed 6 years  
Required redemption term, under condition of termination of employment of employed selling shareholders 5 years