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Redeemable Non-Controlling Interests (Details) - USD ($)
$ in Thousands
3 Months Ended
Feb. 01, 2020
Jan. 01, 2020
Mar. 31, 2020
Mar. 31, 2019
Noncontrolling Interest [Line Items]        
Aggregate purchase price     $ 366,203 $ 0
Increase (Decrease) in Temporary Equity [Roll Forward]        
Balance, beginning   $ 974,541 974,541 780,488
Net income attributable to redeemable non-controlling interests     7,256 7,700
Distributions to and purchases of redeemable non-controlling interests     5,687 2,771
Purchase of membership interests of Concentra Group Holdings Parent (Note 4)     (366,203) 0
Redemption adjustment on redeemable non-controlling interests     10,123 47,470
Other     347 354
Balance, ending     $ 620,377 $ 833,241
Concentra Group Holdings Parent, LLC        
Noncontrolling Interest [Line Items]        
Aggregate purchase price $ 27,800 $ 338,400    
Concentra Group Holdings Parent, LLC        
Noncontrolling Interest [Line Items]        
Percentage of membership interests purchased 1.40% 17.20%    
Outstanding member interest 66.60%      
Concentra Group Holdings Parent, LLC | Class A Units        
Noncontrolling Interest [Line Items]        
Outstanding member interest 68.80%