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Real Estate Investments, Net - Additional Information (Detail)
3 Months Ended 50 Months Ended 62 Months Ended
Mar. 31, 2020
USD ($)
Building
Mar. 31, 2019
USD ($)
Mar. 31, 2020
Mar. 31, 2020
Building
Acquisition
Real Estate Properties [Line Items]        
Number of buildings acquired from unaffiliated parties | Building       94
Depreciation $ 7,839,000 $ 6,960,000    
Maximum percentage of fees and expenses associated with the acquisition 6.00%   6.00%  
Number of acquisitions completed from unaffiliated parties | Acquisition       46
Capitalized acquisition costs and fees additions $ 2,510,000      
Medical Office Building        
Real Estate Properties [Line Items]        
Capital expenditures incurred 1,151,000      
Skilled Nursing Facilities        
Real Estate Properties [Line Items]        
Capital expenditures incurred 532,000      
Senior Housing-RIDEA        
Real Estate Properties [Line Items]        
Capital expenditures incurred 405,000      
Senior Housing        
Real Estate Properties [Line Items]        
Capital expenditures incurred $ 0      
Advisor        
Real Estate Properties [Line Items]        
Base acquisition fee for property acquired 2.25%      
2020 Acquisitions        
Real Estate Properties [Line Items]        
Number of buildings acquired from unaffiliated parties | Building 7