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Organization and Nature of Business - Additional Information (Details)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Oct. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Property
Investment
Dec. 31, 2017
Property
Organization And Nature Of Business [Line Items]        
Investment in real estate properties and mortgage notes receivable     $ 590.2  
Number of real estate properties | Property     34 32
Number of healthcare-related real estate debt investments | Investment     6  
Ownership interest     100.00%  
Percentage of annual taxable income distribute to shareholders.     90.00%  
IPO        
Organization And Nature Of Business [Line Items]        
Aggregate net proceeds from offering   $ 221.6    
Offering expenses paid $ 2.7      
Preferred stock redemption amount   131.4    
Repayment of secured credit facility   $ 94.8    
Acute Care Hospital        
Organization And Nature Of Business [Line Items]        
Ownership percentage by parent     51.00%