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Business Combinations - Textual (Details)
1 Months Ended 12 Months Ended
Apr. 30, 2015
USD ($)
bed
Nov. 30, 2014
USD ($)
bed
Jun. 30, 2014
USD ($)
Dec. 31, 2016
USD ($)
facilities
state
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
facilities
state
Nov. 30, 2016
location
Oct. 31, 2016
location
Sep. 30, 2016
location
Aug. 31, 2016
bed
Jul. 31, 2016
location
May 31, 2016
location
Feb. 29, 2016
bed
Nov. 30, 2015
facilities
Oct. 31, 2015
USD ($)
lease
bed
hospital
May 31, 2015
bed
Mar. 31, 2014
Business Acquisition [Line Items]                                  
Increase in goodwill       $ 51,400,000 $ 806,100,000 $ 593,100,000                      
Number of states in which acquired entity operates | state       35                          
Redeemable noncontrolling interests       $ 138,300,000 121,100,000                        
Gain on consolidation of acquired entoty       0 0 27,200,000                      
Fairlawn Rehabilitation Hospital [Member]                                  
Business Acquisition [Line Items]                                  
Gain on consolidation of acquired entoty           $ 27,200,000                      
2014 Acquisitions [Member]                                  
Business Acquisition [Line Items]                                  
Proforma tax rate (percent)           40.00%                      
Inpatient Rehabilitation Segment [Member]                                  
Business Acquisition [Line Items]                                  
Increase in goodwill       $ 8,900,000 $ 641,600,000 $ 600,000                      
Number of Joint Venture hospitals accounted for using equity method of accounting | facilities       1                          
Number of states in which acquired entity operates | state       30                          
Inpatient Rehabilitation Segment [Member] | CHI St. Vincent Hot Springs [Member]                                  
Business Acquisition [Line Items]                                  
Interest acquired in business acquisition (percent)                         50.00%        
Number of beds acquired | bed                         20        
Inpatient Rehabilitation Segment [Member] | St. Joseph Regional Health Center (Bryan) [Member]                                  
Business Acquisition [Line Items]                                  
Interest acquired in business acquisition (percent)                   50.00%              
Number of beds acquired | bed                   19              
Inpatient Rehabilitation Segment [Member] | The Bernsen Rehabilitation Center at St. John (Broken Arrow) [Member]                                  
Business Acquisition [Line Items]                                  
Interest acquired in business acquisition (percent)                   51.00%              
Number of beds acquired | bed                   24              
Inpatient Rehabilitation Segment [Member] | Reliant [Member]                                  
Business Acquisition [Line Items]                                  
Number of beds acquired | bed                             902    
Number of leases treated as capital leases | lease                             7    
Number of locations | hospital                             11    
Capital lease obligation                             $ 210,000,000    
Remaining minority limited partner interest (percent)                             0.50%    
Goodwill expected to be tax-deductible (percent)                             86.00%    
Proforma tax rate (percent)         40.00%                        
Inpatient Rehabilitation Segment [Member] | Quillen Rehabilitation Hospital [Member]                                  
Business Acquisition [Line Items]                                  
Interest acquired in business acquisition (percent)   50.10%                              
Number of beds acquired | bed   26                              
Goodwill expected to be tax-deductible   $ 0                              
Increase in goodwill   $ 600,000                              
Inpatient Rehabilitation Segment [Member] | All Other Acquisitions [Member]                                  
Business Acquisition [Line Items]                                  
Interest acquired in business acquisition (percent) 83.00%                                
Number of beds acquired | bed 50                                
Goodwill expected to be tax-deductible $ 0     $ 0                          
Increase in goodwill $ 700,000                                
Home Health and Hospice Segment [Member]                                  
Business Acquisition [Line Items]                                  
Increase in goodwill       $ 42,500,000 $ 164,500,000 $ 592,500,000                      
Number of states in which acquired entity operates | state       25                          
Home Health and Hospice Segment [Member] | CareSouth [Member]                                  
Business Acquisition [Line Items]                                  
Goodwill expected to be tax-deductible (percent)                           6.50%      
Home Health and Hospice Segment [Member] | Encompass [Member]                                  
Business Acquisition [Line Items]                                  
Number of locations | facilities           135                      
Goodwill expected to be tax-deductible (percent)           23.00%                      
Number of states in which acquired entity operates | state           12                      
Redeemable noncontrolling interests           $ 64,500,000                      
Subsidiary's common stock held by subsidiary 's management (percent)           16.70%                      
Home Health and Hospice Segment [Member] | All Other Acquisitions [Member]                                  
Business Acquisition [Line Items]                                  
Goodwill expected to be tax-deductible         $ 20,300,000                        
Noncompete Agreements [Member] | Home Health and Hospice Segment [Member] | All Other Acquisitions [Member]                                  
Business Acquisition [Line Items]                                  
Goodwill expected to be tax-deductible       $ 41,400,000                          
Hospice [Member] | Home Health and Hospice Segment [Member] | Home Health Agency of Georgia, LLC (“Camellia”) [Member]                                  
Business Acquisition [Line Items]                                  
Number of locations | location                       2          
Hospice [Member] | Home Health and Hospice Segment [Member] | Sotto International, Inc. (“Serenity”) [Member]                                  
Business Acquisition [Line Items]                                  
Number of locations | location                 3                
Hospice [Member] | Home Health and Hospice Segment [Member] | Honor Hospice, LLC (“Honor”) [Member]                                  
Business Acquisition [Line Items]                                  
Number of locations | location             1                    
Hospice [Member] | Home Health and Hospice Segment [Member] | CareSouth [Member]                                  
Business Acquisition [Line Items]                                  
Number of locations | facilities                           3      
Home health [Member] | Home Health and Hospice Segment [Member] | Summit Home Health Care, Inc. (“Summit”) [Member]                                  
Business Acquisition [Line Items]                                  
Number of locations | location               2                  
Home health [Member] | Home Health and Hospice Segment [Member] | Advantage Health Inc. (“Advantage”) [Member]                                  
Business Acquisition [Line Items]                                  
Number of locations | location                     1            
Home health [Member] | Home Health and Hospice Segment [Member] | LightHouse Health Care, Inc. (“LightHouse”) [Member]                                  
Business Acquisition [Line Items]                                  
Number of locations | location               1                  
Home health [Member] | Home Health and Hospice Segment [Member] | Gulf City Home Care, Inc. (“Gulf City”) [Member]                                  
Business Acquisition [Line Items]                                  
Number of locations | location             1                    
Home health [Member] | Home Health and Hospice Segment [Member] | CareSouth [Member]                                  
Business Acquisition [Line Items]                                  
Number of locations | facilities                           44      
Inpatient [Member] | Inpatient Rehabilitation Segment [Member] | All Other Acquisitions [Member]                                  
Business Acquisition [Line Items]                                  
Number of beds acquired | bed                               158  
Skilled Nursing [Member] | Inpatient Rehabilitation Segment [Member] | All Other Acquisitions [Member]                                  
Business Acquisition [Line Items]                                  
Number of beds acquired | bed                               74  
Corporate Joint Venture [Member] | Inpatient Rehabilitation Segment [Member] | Fairlawn Rehabilitation Hospital [Member]                                  
Business Acquisition [Line Items]                                  
Interest acquired in business acquisition (percent)     30.00%                            
Increase in goodwill     $ 34,000,000                            
Ownership interest prior to acquisition (percent)                                 50.00%
Ownership interest after acquisition (percent)     80.00%                            
Gain on consolidation of acquired entoty     $ 27,000,000                            
Corporate Joint Venture [Member] | Home health [Member] | Home Health and Hospice Segment [Member]                                  
Business Acquisition [Line Items]                                  
Number of Joint Venture hospitals accounted for using equity method of accounting | facilities                           2