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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Loans At Acquisition Date [Line Items]        
Rental Revenue $ 502 $ 427 $ 508 $ 611
Earnings 233 242 236 255
Egg Harbor Township, NJ [Member]
       
Loans At Acquisition Date [Line Items]        
Acquisition Date     Mar. 28, 2013  
Rental Revenue 122   128  
Earnings 69   72  
Vance, AL [Member]
       
Loans At Acquisition Date [Line Items]        
Acquisition Date     May 08, 2013  
Rental Revenue 170   170  
Earnings 70   70  
Blaine, MN [Member]
       
Loans At Acquisition Date [Line Items]        
Acquisition Date     May 10, 2013  
Rental Revenue 210   210  
Earnings 94   94  
Ashburn, VA [Member]
       
Loans At Acquisition Date [Line Items]        
Acquisition Date       Jan. 25, 2012
Rental Revenue   247   431
Earnings   147   160
Ottumwa, IA [Member]
       
Loans At Acquisition Date [Line Items]        
Acquisition Date       May 30, 2012
Rental Revenue   61   61
Earnings   30   30
New Albany, OH [Member]
       
Loans At Acquisition Date [Line Items]        
Acquisition Date       Jun. 05, 2012
Rental Revenue   98   98
Earnings   51   51
Columbus, GA [Member]
       
Loans At Acquisition Date [Line Items]        
Acquisition Date       Jun. 21, 2012
Rental Revenue   18   18
Earnings   11   11
Columbus, OH [Member]
       
Loans At Acquisition Date [Line Items]        
Acquisition Date       Jun. 28, 2012
Rental Revenue   3   3
Earnings   $ 3   $ 3