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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Significant Accounting Policies [Line Items]      
Federal Deposit Insurance Corporation deposit insurance limit per institution $ 250,000    
Restricted cash $ 4,449,000   $ 4,864,000
Acquisition of above-market in-place leases, amortization period 6 months    
Amortization expense for intangible assets $ 396,000 $ 371,000  
Write-off of fully amortized intangible assets 0 447,000  
Additional amortization expense on current in-place intangible assets for the remainder of 2021 396,000    
Depreciation expense 16,156,000 14,457,000  
Write-off of fully depreciated fixed assets 1,506,000 0  
Casualty losses 359,000    
Bad debt expense 433,000 337,000  
Deferred rent receivable from residents 41,000    
Advertising expenses 544,000 608,000  
Transfers of assets between Level 1 and Level 2 0    
Transfers of assets between Level 2 and Level 1 0    
Transfers of liabilities between Level 1 and Level 2 0    
Transfers of liabilities between Level 2 and Level 1 0    
Income tax expense $ 0 0  
Percentage of minimum taxable income distributable to stockholders 90.00%    
Subsequent disqualification period if failed to qualify as REIT 4 years    
Topic 842      
Significant Accounting Policies [Line Items]      
Right-of-use assets $ 2,553,000    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets    
Lease liability $ 2,903,000    
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other liabilities    
Total operating lease expense $ 172,000    
Natural Disasters and Other Insurable Events      
Significant Accounting Policies [Line Items]      
Rent revenue recognized 23,000 $ 3,000  
COVID-19      
Significant Accounting Policies [Line Items]      
Bad debt expense $ 47,000    
Building and Building Improvements      
Significant Accounting Policies [Line Items]      
Depreciable Lives 40 years    
Minimum      
Significant Accounting Policies [Line Items]      
Percentage of rent deferment on monthly rent 25.00%    
Deferred rent payment term 1 month    
Minimum | Equipment and Fixtures      
Significant Accounting Policies [Line Items]      
Depreciable Lives 5 years    
Maximum      
Significant Accounting Policies [Line Items]      
Cash and cash equivalents maturity period 3 months    
Percentage of rent deferment on monthly rent 75.00%    
Deferred rent payment term 3 months    
Maximum | Topic 842      
Significant Accounting Policies [Line Items]      
Operating lease term 10 years    
Maximum | Equipment and Fixtures      
Significant Accounting Policies [Line Items]      
Depreciable Lives 10 years