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Real Estate Acquired and Sold - Additional Information (Detail)
 1 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2015
USD ($)
a
Dec. 31, 2014
USD ($)
property
Aug. 31, 2014
USD ($)
Apr. 30, 2014
USD ($)
ft²
Jan. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
property
Mar. 31, 2014
USD ($)
Business Acquisition [Line Items]                
Aggregate cost             $ 68,000,000  
Property acquisition costs   $ 900,000         $ 900,000  
Number of properties purchased | property   5         5  
Olney Center                
Business Acquisition [Line Items]                
Name of property       Olney Center        
Location of property       Olney, Maryland        
Proceeds from sale of real estate       $ 11,000,000   $ 11,000,000    
Area of real estate property (in sq ft/acre) | ft²       53,765        
Lease term       P20Y        
Sale leaseback, option to purchase the property       $ 14,600,000   14,600,000    
Sales price of property           $ 11,000,000    
Annual increase in rental payments, percentage           1.50%    
Giant Center                
Business Acquisition [Line Items]                
Name of property       Giant Center        
Location of property       Milford Mill, Maryland        
Proceeds from sale of real estate       $ 7,500,000        
Area of real estate property (in sq ft/acre) | ft²       70,040        
Gain on sale of real estate       $ 6,100,000        
Assets held-for-sale               $ 500,000
Liabilities of assets held-for-sale               $ 100,000
1580 Rockville Pike                
Business Acquisition [Line Items]                
Aggregate cost         $ 8,000,000      
Name of property         1580 Rockville Pike      
Property acquisition costs         $ 200,000      
1582 Rockville Pike                
Business Acquisition [Line Items]                
Aggregate cost       $ 11,000,000        
Name of property       1582 Rockville Pike        
Property acquisition costs       $ 200,000        
Location of property       Rockville, Maryland        
1584 Rockville Pike                
Business Acquisition [Line Items]                
Aggregate cost   $ 6,200,000            
Name of property   1584 Rockville Pike            
Property acquisition costs   $ 200,000         $ 200,000  
750 N. Glebe Road                
Business Acquisition [Line Items]                
Aggregate cost     $ 40,000,000          
Name of property     750 N. Glebe Road          
Property acquisition costs     $ 400,000          
730 N. Glebe Road                
Business Acquisition [Line Items]                
Aggregate cost   $ 2,800,000            
Name of property   730 N. Glebe Road            
Property acquisition costs   $ 40,400         $ 40,400  
Westview Pad                
Business Acquisition [Line Items]                
Aggregate cost $ 900,000              
Area of real estate property (in sq ft/acre) | a 1.1