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Concentration of Credit Risk (Details) - Customer Concentration Risk
12 Months Ended
Dec. 31, 2018
state
province
Dec. 31, 2017
state
Dec. 31, 2016
state
Concentration Risk [Line Items]      
Number of US states in which entity operates 45    
Number of Canadian provinces in which entity operates | province 7    
Number of states accounting for more than ten percent of revenues and net operating income 1 1 1
Continuing revenues and NOI from properties located in California 10.00% 10.00% 10.00%
Total Gross Book Value of Properties | Hospitals, Medical Office Building and other      
Concentration Risk [Line Items]      
Percentage of real estate investments based on gross book value (as a percent) 38.40%    
Total Gross Book Value of Properties | Triple Net Leased Properties | Seniors Housing Communities      
Concentration Risk [Line Items]      
Percentage of real estate investments based on gross book value (as a percent) 22.10%    
Total Gross Book Value of Properties | Senior Living Operations | Seniors Housing Communities      
Concentration Risk [Line Items]      
Percentage of real estate investments based on gross book value (as a percent) 39.50%    
Total Gross Book Value of Properties | Atria      
Concentration Risk [Line Items]      
Percentage of real estate investments based on gross book value (as a percent) 22.10%    
Total Gross Book Value of Properties | Sunrise      
Concentration Risk [Line Items]      
Percentage of real estate investments based on gross book value (as a percent) 11.00%    
Total Gross Book Value of Properties | Brookdale Senior Living      
Concentration Risk [Line Items]      
Percentage of real estate investments based on gross book value (as a percent) 8.40%    
Total Gross Book Value of Properties | Ardent      
Concentration Risk [Line Items]      
Percentage of real estate investments based on gross book value (as a percent) 5.20%    
Total Gross Book Value of Properties | Eclipse Senior Living      
Concentration Risk [Line Items]      
Percentage of real estate investments based on gross book value (as a percent) 3.90%    
Total Gross Book Value of Properties | Kindred      
Concentration Risk [Line Items]      
Percentage of real estate investments based on gross book value (as a percent) 1.10%