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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Significant Accounting Policies [Line Items]            
Federal Deposit Insurance Corporation deposit insurance limit per institution $ 250,000   $ 250,000      
Restricted cash 7,780,000   7,780,000     $ 6,729,000
Amortization expense for intangible assets 294,000 $ 1,044,000 850,000 $ 2,336,000    
Additional amortization expense on current in-place intangible assets 210,000   210,000      
Write-off of intangible assets 719,000 0 1,532,000 1,963,000    
Depreciation expense 12,427,000 10,539,000 24,318,000 20,471,000    
Uncollectible rental revenue 236,000   535,000      
Bad debt expense (recoveries)   (115,000)   49,000    
Advertising expenses 603,000 564,000 1,151,000 1,097,000    
Transfers of assets between Level 1 and Level 2 0   0      
Transfers of assets between Level 2 and Level 1 0   0      
Transfers of liabilities between Level 1 and Level 2 0   0      
Transfers of liabilities between Level 2 and Level 1 0   0      
Income tax expense 0 0 $ 0 0    
Taxable income distributable to stockholders     90.00%      
Cumulative-effect adjustment     $ 0      
Topic 842            
Significant Accounting Policies [Line Items]            
Right-of-use assets $ 3,113,000   $ 3,113,000   $ 308,000  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets   us-gaap:OtherAssets      
Lease liability $ 3,206,000   $ 3,206,000   $ 308,000  
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities   us-gaap:OtherLiabilities      
Total operating lease expense $ 167,000   $ 279,000      
Natural Disasters and Other Insurable Events            
Significant Accounting Policies [Line Items]            
Rent revenue recognized 17,000 $ 64,000 $ 23,000 $ 106,000    
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 $ 316,000   $ 316,000      
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   10 years      
Maximum | Equipment and Fixtures            
Significant Accounting Policies [Line Items]            
Depreciable Lives     10 years