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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Significant Accounting Policies [Line Items]            
Federal Deposit Insurance Corporation deposit insurance limit per institution $ 250,000 $ 250,000   $ 250,000    
Restricted cash 6,138,000 6,138,000   $ 6,138,000   $ 4,864,000
Acquisition of above-market in-place leases, amortization period       6 months    
Amortization expense for intangible assets   368,000 $ 73,000 $ 1,203,000 $ 631,000  
Write-off of fully amortized intangible assets   0 211,000 792,000 1,171,000  
Additional amortization expense on current in-place intangible assets for the remainder of 2021 346,000 346,000   346,000    
Depreciation expense   17,016,000 15,159,000 49,496,000 44,660,000  
Casualty losses   0 0 359,000 411,000  
Investments in joint ventures 13,561,000 13,561,000   13,561,000   0
Income or losses from equity method investments   0 0 0 0  
Bad debt expense   655,000 340,000 1,678,000 1,428,000  
Deferred rent receivable from residents 0 0   0   $ 175,000
Advertising expenses   624,000 667,000 1,804,000 1,827,000  
Transfers of assets between Level 1 and Level 2 0 0   0    
Transfers of assets between Level 2 and Level 1 0 0   0    
Transfers of liabilities between Level 1 and Level 2 0 0   0    
Transfers of liabilities between Level 2 and Level 1 0 0   0    
Income tax expense   0 0 $ 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 $ 2,360,000 $ 2,360,000   $ 2,360,000    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets Other assets   Other assets    
Lease liability $ 2,701,000 $ 2,701,000   $ 2,701,000    
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other liabilities Other liabilities   Other liabilities    
Total operating lease expense   $ 172,000   $ 510,000    
Natural Disasters and Other Insurable Events            
Significant Accounting Policies [Line Items]            
Rent revenue recognized   28,000 $ 32,000 69,000 $ 184,000  
COVID-19            
Significant Accounting Policies [Line Items]            
Bad debt expense   121,000   246,000    
Building and Building Improvements            
Significant Accounting Policies [Line Items]            
Depreciable Lives 40 years          
Leases Acquired In Place            
Significant Accounting Policies [Line Items]            
Acquisition of above-market in-place leases   $ 0   $ 757,000    
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 10 years   10 years    
Maximum | Equipment and Fixtures            
Significant Accounting Policies [Line Items]            
Depreciable Lives       10 years