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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Significant Accounting Policies [Line Items]      
Federal Deposit Insurance Corporation deposit insurance limit per institution $ 250,000    
Restricted cash 5,645,000   $ 4,634,000
Bad debt expense 164,000 $ 314,000  
Amortization expense for intangible assets 1,291,000 55,000  
Recorded wrote-off intangible assets 1,963,000 0  
Additional amortization expense on current intangible assets 1,373,000    
Depreciation expense 9,931,000 7,552,000  
Recognized contract assets 0    
Recognized contract liabilities 0    
Advertising expenses 533,000 426,000  
Income tax expense $ 0 0  
Taxable income distributable to stockholders 90.00%    
Decrease in net cash used in investing activities due to new accounting standard adoption $ (94,251,000) (31,059,000)  
ASC Topic 230      
Significant Accounting Policies [Line Items]      
Decrease in net cash used in investing activities due to new accounting standard adoption   57,000  
Natural Disasters and Other Insurable Events      
Significant Accounting Policies [Line Items]      
Rent revenue recognized $ 42,000 $ 51,000  
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 $ 1,641,000    
Maximum      
Significant Accounting Policies [Line Items]      
Cash And Cash Equivalents Maturity Period 3 months    
Maximum | Equipment and Fixtures      
Significant Accounting Policies [Line Items]      
Depreciable Lives 10 years    
Minimum | Equipment and Fixtures      
Significant Accounting Policies [Line Items]      
Depreciable Lives 5 years