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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Dec. 31, 2018
Significant Accounting Policies [Line Items]        
Federal Deposit Insurance Corporation deposit insurance limit per institution $ 250,000      
Restricted cash 7,122,000     $ 6,729,000
Amortization expense for intangible assets 556,000 $ 1,291,000    
Write-off of amortized intangible assets 813,000 1,963,000    
Additional amortization expense on current in-place intangible assets 188,000      
Depreciation expense 11,891,000 9,931,000    
Uncollectible rental revenue 299,000      
Bad debt expense   164,000    
Advertising expenses 548,000 533,000    
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    
Taxable income distributable to stockholders 90.00%      
Cumulative-effect adjustment $ 0      
Topic 842        
Significant Accounting Policies [Line Items]        
Right-of-use assets $ 3,172,000   $ 308,000  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets      
Lease liability $ 3,172,000   $ 308,000  
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities      
Total operating lease expense $ 112,000      
Natural Disasters and Other Insurable Events        
Significant Accounting Policies [Line Items]        
Rent revenue recognized $ 6,000 $ 42,000    
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      
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      
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