Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Schedule of Revenue and Earnings Recognized on Properties Acquired (Detail)

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Real Estate and Intangible Assets - Schedule of Revenue and Earnings Recognized on Properties Acquired (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Business Acquisition [Line Items]        
Rental Revenue $ 2,207 $ 1,025 $ 2,716 $ 1,637
Net Income 802 558 1,037 915
Egg Harbor Township, NJ [Member]
       
Business Acquisition [Line Items]        
Acquisition Date     Mar. 28, 2013  
Rental Revenue 122   250  
Net Income 61   130  
Vance, AL [Member]
       
Business Acquisition [Line Items]        
Acquisition Date     May 08, 2013  
Rental Revenue 293   464  
Net Income 147   218  
Blaine, MN [Member]
       
Business Acquisition [Line Items]        
Acquisition Date     May 10, 2013  
Rental Revenue 369   579  
Net Income 161   256  
Austin, TX [Member]
       
Business Acquisition [Line Items]        
Acquisition Date     Jul. 09, 2013  
Rental Revenue 1,098   1,098  
Net Income 297   297  
Allen, TX [Member]
       
Business Acquisition [Line Items]        
Acquisition Date     Jul. 10, 2013  
Rental Revenue 325   325  
Net Income 136   136  
Ashburn, VA [Member]
       
Business Acquisition [Line Items]        
Acquisition Date       Jan. 25, 2012
Rental Revenue   247   678
Net Income   147   409
Ottumwa, IA [Member]
       
Business Acquisition [Line Items]        
Acquisition Date       May 30, 2012
Rental Revenue   173   235
Net Income   85   116
New Albany, OH [Member]
       
Business Acquisition [Line Items]        
Acquisition Date       Jun. 05, 2012
Rental Revenue   339   437
Net Income   197   248
Columbus, GA [Member]
       
Business Acquisition [Line Items]        
Acquisition Date       Jun. 21, 2012
Rental Revenue   164   182
Net Income   88   98
Columbus, OH [Member]
       
Business Acquisition [Line Items]        
Acquisition Date       Jun. 28, 2012
Rental Revenue   83   86
Net Income   31   34
Jupiter, FL [Member]
       
Business Acquisition [Line Items]        
Acquisition Date       Sep. 26, 2012
Rental Revenue   19   19
Net Income   $ 10   $ 10