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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2021
USD ($)
JointVenture
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Significant Accounting Policies [Line Items]      
Federal Deposit Insurance Corporation deposit insurance limit per institution $ 250,000    
Restricted cash $ 29,699,000 $ 4,864,000  
Acquisition of above-market in-place leases, amortization period 6 months    
Amortization expense for intangible assets $ 5,125,000 631,000 $ 1,599,000
Write-off of fully amortized intangible assets 1,549,000 1,171,000 1,846,000
Amortization expense for intangible assets expected for 2021 53,269,000    
Depreciation expense 70,578,000 60,056,000 51,216,000
Write-off of fully depreciated fixed assets 4,607,000 3,921,000 940,000
Casualty losses 359,000 711,000 0
Investments in unconsolidated real estate entities 24,999,000    
Income or losses from equity method investments 0 0  
Investment in real estate under development 41,777,000 0  
Provision for bad debts 2,862,000 1,842,000 1,142,000
Advertising expenses 2,511,000 2,338,000 2,350,000
Income tax expense $ 0 $ 0 $ 0
Percentage of minimum taxable income distributable to stockholders 90.00%    
Subsequent disqualification period if failed to qualify as REIT 4 years    
Dividends characterized as capital gain distributions 100.00% 20.00% 69.00%
Dividends characterized as ordinary income percentage 0.00% 37.00% 16.00%
Dividends characterized as return of capital   43.00% 15.00%
Topic 842      
Significant Accounting Policies [Line Items]      
Right-of-use assets $ 2,919,000 $ 2,649,000  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets Other assets  
Lease liability $ 3,255,000 $ 3,002,000  
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other liabilities Other liabilities Other liabilities
Total operating lease expense $ 706,000 $ 616,000 $ 589,000
Natural Disasters and Other Insurable Events      
Significant Accounting Policies [Line Items]      
Rent revenue recognized 88,000 208,000 $ 156,000
COVID-19      
Significant Accounting Policies [Line Items]      
Provision for bad debts $ 629,000 927,000  
Richmond, VA and Nashville, TN      
Significant Accounting Policies [Line Items]      
Number of joint ventures | JointVenture 2    
North Carolina      
Significant Accounting Policies [Line Items]      
Percentage of rental revenue 17.02%    
Georgia      
Significant Accounting Policies [Line Items]      
Percentage of rental revenue 10.52%    
Texas      
Significant Accounting Policies [Line Items]      
Percentage of rental revenue 10.34%    
Florida      
Significant Accounting Policies [Line Items]      
Percentage of rental revenue 10.08%    
Tennessee      
Significant Accounting Policies [Line Items]      
Percentage of rental revenue 9.72%    
Ohio      
Significant Accounting Policies [Line Items]      
Percentage of rental revenue 9.29%    
Kentucky      
Significant Accounting Policies [Line Items]      
Percentage of rental revenue 9.08%    
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 $ 58,806,000 $ 1,013,000  
Minimum | Furniture, Fixtures and Equipment      
Significant Accounting Policies [Line Items]      
Depreciable Lives 5 years    
Maximum      
Significant Accounting Policies [Line Items]      
Cash and cash equivalents original maturity period 3 months    
Maximum | Topic 842      
Significant Accounting Policies [Line Items]      
Operating lease term 10 years    
Maximum | Furniture, Fixtures and Equipment      
Significant Accounting Policies [Line Items]      
Depreciable Lives 10 years