Subsequent Events - Additional Information (Detail)
12 Months Ended
Mar. 19, 2015
USD ($)
$ / shares
shares
Jan. 09, 2015
USD ($)
a
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jul. 01, 2015
USD ($)
ft²
Apr. 15, 2015
USD ($)
ft²
Jan. 14, 2015
USD ($)
ft²
Subsequent Event [Line Items]                
Consideration paid with cash     $ 138,115,158 $ 63,616,509 $ 69,995,602      
Consideration paid with common units     $ 3,068,550 $ 6,805,559 $ 945,271      
Laskin Road [Member]                
Subsequent Event [Line Items]                
Area of Land | a   1.5            
Property contract price   $ 1,600,000            
Consideration paid with cash   $ 150,000            
Beaver Ruin Village [Member]                
Subsequent Event [Line Items]                
Property acquired, square foot of store purchased | ft²           74,048    
Property contract price           $ 12,400,000    
Pierpont Centre [Member]                
Subsequent Event [Line Items]                
Property acquired, square foot of store purchased | ft²               122,259
Property contract price               $ 13,900,000
Percentage leased               100.00%
Butler Square [Member]                
Subsequent Event [Line Items]                
Property acquired, square foot of store purchased | ft²             82,400  
Property contract price             $ 9,400,000  
Private Placement [Member] | Series C Preferred Stock [Member]                
Subsequent Event [Line Items]                
Preferred stock issued (in shares) | shares 93,000              
Preferred Stock, Liquidation Preference Per Share | $ / shares $ 1,000              
Proceeds from Issuance of Convertible Preferred Stock $ 93,000,000              
Proceeds from Issuance of Redeemable Convertible Preferred Stock 90,000,000              
Value of Series B Preferred Stock to be converted into Series C preferred stock $ 3,000,000              
Share Price | $ / shares $ 1,000              
Adjusted conversion price of preferred to common (in usd per share) | $ / shares $ 2.00