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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Significant Accounting Policies [Line Items]      
Restricted cash $ 5,575,000   $ 5,518,000
Bad debt expense 314,000 $ 219,000  
Amortization expense for intangible assets 55,000 3,735,000  
Additional amortization expense on current in-place intangible assets 269,000    
Depreciation expense 7,552,000 7,791,000  
Advertising expenses 426,000 447,000  
Property management expenses 1,538,000 1,262,000  
Income tax expense $ 0 0  
Taxable income distributable to stockholders 90.00%    
General and Administrative Expenses      
Significant Accounting Policies [Line Items]      
Asset management and incentive fees $ 0 1,696,000  
Natural Disasters and Other Insurable Events      
Significant Accounting Policies [Line Items]      
Rent revenue recognized $ 51,000 $ 75,000  
Building and Building Improvements      
Significant Accounting Policies [Line Items]      
Depreciable Lives 40 years    
Minimum | Equipment and Fixtures      
Significant Accounting Policies [Line Items]      
Depreciable Lives 5 years    
Maximum | Equipment and Fixtures      
Significant Accounting Policies [Line Items]      
Depreciable Lives 10 years    
Leases Acquired In Place | Lakes of Northdale      
Significant Accounting Policies [Line Items]      
Acquisition of above-market in-place leases $ 309,000