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Real Estate Activities - 2018 Activity - Additional Information (Detail)
$ in Thousands, € in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2018
USD ($)
Aug. 28, 2018
EUR (€)
Hospital
Mar. 31, 2017
USD ($)
Aug. 31, 2018
USD ($)
Hospital
Aug. 31, 2018
EUR (€)
Hospital
Jun. 30, 2018
EUR (€)
Hospital
Mar. 31, 2018
USD ($)
Oct. 31, 2016
USD ($)
RenewalOption
Dec. 31, 2018
EUR (€)
Hospital
Dec. 31, 2018
USD ($)
Hospital
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]                        
Ownership interest in joint venture under the equity method value included in other assets | $                   $ 520,058 $ 288,398  
Gain on sale of real estate | $     $ 7,400                  
Mortgage financing | $                   $ 50,783 $ 717,928 $ 612,836
Germany [Member] | Rehabilitation Hospital with Covenant Health System [Member]                        
Business Acquisition [Line Items]                        
Number of facilities acquired | Hospital                   3    
Primotop Holdings S.a.r.l. [Member] | Germany [Member] | Acute Care Hospital [Member]                        
Business Acquisition [Line Items]                        
Gain on sale of real estate | $ $ 500                      
2018 [Member] | General Acute Care Hospital and Healthcare System [Member]                        
Business Acquisition [Line Items]                        
Number of facilities acquired | Hospital                   5    
Term of lease               15 years        
Mortgage financing | $             $ 764,400 $ 764,400        
Number of lease extension options | RenewalOption               3        
Term of lease extension, years               5 years        
2018 [Member] | Germany [Member] | Acute Care Hospital [Member]                        
Business Acquisition [Line Items]                        
Ownership interest in joint venture under the equity method         50.00%              
Ownership interest in joint venture under the equity method value included in other assets | €         € 210.0              
Shareholder loan to joint venture | €         290.0              
Gain on sale of real estate         500.0         $ 720,000    
2018 [Member] | Germany [Member] | Rehabilitation Hospital with Covenant Health System [Member]                        
Business Acquisition [Line Items]                        
Number of facilities acquired | Hospital   3       4     4      
Purchase price of acquisition | €   € 17.3       € 23.0     € 23.0      
2018 [Member] | Germany [Member] | Rehabilitation Hospital with Covenant Health System [Member] | MEDIAN [Member]                        
Business Acquisition [Line Items]                        
Term of lease   27 years                    
Lease rent increase percentage   70.00%                    
Lease rate   1.00%                    
2018 [Member] | Germany [Member] | Fair Value [Member] | Acute Care Hospital [Member]                        
Business Acquisition [Line Items]                        
Aggregate fair value of ownership interest | €         € 1,635.0              
2018 [Member] | Pasco, Washington [Member] | Acute Care Hospital [Member]                        
Business Acquisition [Line Items]                        
Purchase price of acquisition | $       $ 17,500                
2018 [Member] | Massachusetts [Member] | General Acute Care Hospital and Healthcare System [Member]                        
Business Acquisition [Line Items]                        
Number of facilities acquired | Hospital                   4    
2018 [Member] | Texas [Member] | General Acute Care Hospital and Healthcare System [Member] | Steward Health Care System LLC [Member]                        
Business Acquisition [Line Items]                        
Number of facilities acquired | Hospital                   1    
2018 [Member] | Primotop Holdings S.a.r.l. [Member] | Germany [Member] | Acute Care Hospital [Member]                        
Business Acquisition [Line Items]                        
Ownership interest in joint venture under the equity method         50.00%              
Number of facilities acquired | Hospital       71 71              
Proceeds from joint venture | €         € 1,140.0