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Subsequent Events - Additional Information (Details)
12 Months Ended
Feb. 13, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
properties
Feb. 22, 2019
USD ($)
Jan. 18, 2019
USD ($)
ft²
bed
Subsequent Event [Line Items]          
Number of operating healthcare properties | properties     40    
Acquisition price   $ 271,000,000 $ 1,414,179,000    
Long-term line of credit, amount funded   $ 1,532,853,000 $ 1,477,468,000    
Subsequent Events          
Subsequent Event [Line Items]          
Size of property | ft²         27,000
Number of beds | bed         208
Annualized base rent, percentage       $ 0.208  
Construction Loans | Subsequent Events          
Subsequent Event [Line Items]          
Maximum borrowing capacity         $ 15,500,000
Effective fixed interest rate         5.50%
Debt instrument, interest rate, stated percentage, substantial completion         6.25%
Pre-leased development percentage         100.00%
Long-term line of credit, amount funded       $ 5,000,000.0  
Secured Debt | Subsequent Events          
Subsequent Event [Line Items]          
Maximum borrowing capacity $ 15,000,000.0        
Effective fixed interest rate 8.50%        
Loan term 1 year