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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Significant Accounting Policies [Line Items]          
Amortization expense for intangible assets $ 1,380 $ 1,214 $ 3,289 $ 1,944  
Amortization expense for intangible assets expected for remainder of 2015 182   182    
Depreciation expense 4,340 $ 2,018 8,469 $ 3,412  
Mortgage indebtedness, carrying amount 457,202   457,202   $ 400,509
Above Market Leases          
Significant Accounting Policies [Line Items]          
Acquisition of above-market in-place leases 219   $ 219    
Building and Building Improvements          
Significant Accounting Policies [Line Items]          
Depreciable Lives     40 years    
Equipment and Fixtures | Minimum          
Significant Accounting Policies [Line Items]          
Depreciable Lives     5 years    
Equipment and Fixtures | Maximum          
Significant Accounting Policies [Line Items]          
Depreciable Lives     10 years    
Mortgages          
Significant Accounting Policies [Line Items]          
Mortgage indebtedness, carrying amount 442,354   $ 442,354   400,509
Indebtedness fair value $ 446,113   $ 446,113   $ 411,311