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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Significant Accounting Policies [Line Items]        
Federal Deposit Insurance Corporation deposit insurance limit per institution $ 250,000      
Restricted cash $ 4,545,000 $ 6,729,000    
Acquisition of above-market in-place leases, amortization period 6 months      
Amortization expense for intangible assets $ 1,599,000 3,433,000 $ 1,536,000  
Write-off of amortized intangible assets 1,846,000 4,153,000 0  
Amortization expense for intangible assets expected for 2020 410,000      
Depreciation expense 51,216,000 41,788,000 32,665,000  
Write-off of fully depreciated fixed assets 940,000 408,000    
Bad debt expense   644,000    
Advertising expenses 2,350,000 2,172,000 1,806,000  
Income tax expense $ 0 $ 0 $ 0  
Taxable income distributable to stockholders 90.00%      
Dividends characterized as capital gain distributions 69.00% 37.00% 53.00%  
Dividends characterized as ordinary income percentage 16.00% 39.00% 36.00%  
Dividends characterized as return of capital 15.00% 24.00% 11.00%  
Cumulative-effect adjustment $ 0      
Topic 842        
Significant Accounting Policies [Line Items]        
Right-of-use assets $ 2,812,000     $ 308,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets      
Lease liability $ 3,176,000     $ 308,000
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities      
Total operating lease expense $ 589,000 $ 416,000    
ASC Topic 230        
Significant Accounting Policies [Line Items]        
Increase (decrease) in net cash used in investing activities due to new accounting standard adoption   942,000 $ (105,000)  
Natural Disasters and Other Insurable Events        
Significant Accounting Policies [Line Items]        
Rent revenue recognized $ 156,000 195,000 $ 110,000  
North Carolina        
Significant Accounting Policies [Line Items]        
Percentage of rental revenue 15.76%      
Tennessee        
Significant Accounting Policies [Line Items]        
Percentage of rental revenue 10.92%      
Georgia        
Significant Accounting Policies [Line Items]        
Percentage of rental revenue 13.46%      
Kentucky        
Significant Accounting Policies [Line Items]        
Percentage of rental revenue 9.51%      
Florida        
Significant Accounting Policies [Line Items]        
Percentage of rental revenue 9.47%      
Ohio        
Significant Accounting Policies [Line Items]        
Percentage of rental revenue 9.10%      
Texas        
Significant Accounting Policies [Line Items]        
Percentage of rental revenue 7.54%      
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 $ 1,265,000 $ 3,074,000    
Minimum | Equipment and Fixtures        
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 | Equipment and Fixtures        
Significant Accounting Policies [Line Items]        
Depreciable Lives 10 years