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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Significant Accounting Policies [Line Items]          
Amortization expense for intangible assets $ 109,000 $ 983,000 $ 3,397,000 $ 2,927,000  
Amortization expense for intangible assets expected for remainder of 2015 3,809,000   3,809,000    
Amortization expense for intangible assets expected for remainder of 2016 3,735,000   3,735,000    
Depreciation expense 4,594,000 $ 2,326,000 13,064,000 $ 5,737,000  
Mortgage indebtedness, carrying amount 602,408,000   602,408,000   $ 400,509,000
Accumulated other comprehensive income $ 5,000   $ 5,000    
Cash Flow Hedge | 1-month LIBOR          
Significant Accounting Policies [Line Items]          
Interest rate cap strike rate 3.00%   3.00%    
Cash Flow Hedge | Interest Rate Cap          
Significant Accounting Policies [Line Items]          
Derivative, notional amount $ 200,000,000   $ 200,000,000    
Derivative, maturity date     Oct. 17, 2017    
Derivative, fair value 40,000   $ 40,000    
Accumulated other comprehensive income 10,000   10,000    
Reclassified out of accumulated other comprehensive income to earnings, amount 0   0    
Mortgages          
Significant Accounting Policies [Line Items]          
Indebtedness fair value 597,547,000   $ 597,547,000   $ 411,311,000
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    
Leases Acquired In Place          
Significant Accounting Policies [Line Items]          
Acquisition of above-market in-place leases $ 7,471,000   $ 7,690,000