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Concentration of Credit Risk (Details) - Customer Concentration Risk
12 Months Ended
Dec. 31, 2017
province
state
Concentration Risk [Line Items]  
Number of US states in which entity operates 46
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
Total Gross Book Value of Properties | Triple-Net Leased Properties  
Concentration Risk [Line Items]  
Percentage of real estate investments based on gross book value (as a percent) 25.90%
Total Gross Book Value of Properties | Senior Living Operations  
Concentration Risk [Line Items]  
Percentage of real estate investments based on gross book value (as a percent) 35.10%
Atria | Total Gross Book Value of Properties  
Concentration Risk [Line Items]  
Percentage of real estate investments based on gross book value (as a percent) 22.30%
Sunrise | Total Gross Book Value of Properties  
Concentration Risk [Line Items]  
Percentage of real estate investments based on gross book value (as a percent) 10.80%
Brookdale Senior Living | Total Gross Book Value of Properties  
Concentration Risk [Line Items]  
Percentage of real estate investments based on gross book value (as a percent) 7.50%
Ardent | Total Gross Book Value of Properties  
Concentration Risk [Line Items]  
Percentage of real estate investments based on gross book value (as a percent) 4.90%
Kindred | Total Gross Book Value of Properties  
Concentration Risk [Line Items]  
Percentage of real estate investments based on gross book value (as a percent) 1.10%
MOB's, Life Science and Innovation Centers, LTAC's, Health Systems, SNF's and Secured Loans Receivables | Total Gross Book Value of Properties  
Concentration Risk [Line Items]  
Percentage of real estate investments based on gross book value (as a percent) 39.00%