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Real Estate Activities - Development Activities - Additional Information (Detail)
€ in Millions, £ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Dec. 19, 2017
USD ($)
Apr. 30, 2017
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Facility
Dec. 31, 2017
EUR (€)
Facility
Dec. 31, 2016
USD ($)
Facility
Birmingham, England [Member]            
Business Acquisition [Line Items]            
Term of lease, years   15 years        
Purchase price of acquisition | £   £ 2.7        
Total development costs anticipated | £   £ 50.0        
Acute Care Hospital [Member] | Idaho Falls, ID [Member]            
Business Acquisition [Line Items]            
Estimated total development cost $ 113.5          
Development Activities [Member] | Acute Care Facilities [Member]            
Business Acquisition [Line Items]            
Number of facilities constructed | Facility           19
Acquisition costs           $ 136.6
Ernest [Member] | Development Activities [Member]            
Business Acquisition [Line Items]            
Estimated total development cost     $ 25.5     $ 18.4
Adeptus Health [Member] | Development Activities [Member] | Acute Care Facilities [Member]            
Business Acquisition [Line Items]            
Number of facilities constructed | Facility       4 4  
Acquisition costs       $ 68.0    
IMED [Member] | Development Activities [Member] | Acute Care Facilities [Member] | Spain [Member]            
Business Acquisition [Line Items]            
Acquisition costs | €         € 21  
Lessor direct financing lease description     Quarterly fixed rent payments that started on October 1, 2017 with annual increases of 1% beginning April 1, 2020.      
Lease rent increase percentage       1.00% 1.00%  
Ownership interests acquired       50.00% 50.00%  
Term of lease, years       30 years 30 years