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Real Estate Investments, Net - Additional Information (Detail)
3 Months Ended 6 Months Ended 17 Months Ended 53 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Building
Jun. 30, 2018
USD ($)
Jun. 30, 2019
Jun. 30, 2019
Building
Acquisition
Real Estate Properties [Line Items]            
Number of buildings acquired from unaffiliated parties | Building           78
Depreciation $ 6,490,000 $ 3,781,000 $ 13,450,000 $ 7,197,000    
Maximum percentage of fees and expenses associated with the acquisition     6.00% 6.00% 6.00%  
Number of Acquisitions Completed from Unaffiliated Parties | Acquisition           36
Capitalized Acquisition Costs and Fees Additions     $ 2,322,000      
Related Party Transaction, Expenses from Transactions with Related Party 3,731,000 $ 4,154,000 8,148,000 $ 7,129,000    
Medical Office Building [Member]            
Real Estate Properties [Line Items]            
Capital Expenditures Incurred 562,000   846,000      
Senior Housing [Member]            
Real Estate Properties [Line Items]            
Capital Expenditures Incurred     0      
Senior Housing-RIDEA [Member]            
Real Estate Properties [Line Items]            
Capital Expenditures Incurred $ 591,000   898,000      
Skilled Nursing Facilities [Member]            
Real Estate Properties [Line Items]            
Capital Expenditures Incurred     $ 0      
Advisor [Member]            
Real Estate Properties [Line Items]            
Base Acquisition Fee For Property Acquired     2.25%      
Contingent Advisor Payment Fee     2.25%   2.25%  
Contingent Advisor Payment Incurred [Member]            
Real Estate Properties [Line Items]            
Related Party Transaction, Expenses from Transactions with Related Party     $ 417,000      
2019 Acquisitions [Member]            
Real Estate Properties [Line Items]            
Number of buildings acquired from unaffiliated parties | Building     9