Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Business Acquisition [Line Items]        
Rental Revenue $ 2,105 $ 2,207 $ 3,016 $ 2,716
Earnings 1,047 802 1,422 1,037
Allen, TX [Member]
       
Business Acquisition [Line Items]        
Acquisition Date     Mar. 27, 2014 Jul. 10, 2013
Rental Revenue 143 325 293 325
Earnings 101 136 167 136
Colleyville, TX [Member]
       
Business Acquisition [Line Items]        
Acquisition Date     Mar. 27, 2014  
Rental Revenue 117   240  
Earnings 83   138  
Rancho Cordova, CA [Member]
       
Business Acquisition [Line Items]        
Acquisition Date     Apr. 22, 2014  
Rental Revenue 226   399  
Earnings 104   168  
Coppell, TX [Member]
       
Business Acquisition [Line Items]        
Acquisition Date     May 08, 2014  
Rental Revenue 150   239  
Earnings 116   139  
Columbus, OH [Member]
       
Business Acquisition [Line Items]        
Acquisition Date     May 13, 2014  
Rental Revenue 311   479  
Earnings 115   184  
Taylor, PA [Member]
       
Business Acquisition [Line Items]        
Acquisition Date     Jun. 09, 2014  
Rental Revenue 850   1,058  
Earnings 395   493  
Aurora, CO [Member]
       
Business Acquisition [Line Items]        
Acquisition Date     Jul. 01, 2014  
Rental Revenue 192   192  
Earnings 124   124  
Indianapolis, IN [Member]
       
Business Acquisition [Line Items]        
Acquisition Date     Sep. 03, 2014  
Rental Revenue 116   116  
Earnings 9   9  
Egg Harbor Township, NJ [Member]
       
Business Acquisition [Line Items]        
Acquisition Date       Mar. 28, 2013
Rental Revenue   122   250
Earnings   61   130
Vance, AL [Member]
       
Business Acquisition [Line Items]        
Acquisition Date       May 08, 2013
Rental Revenue   293   464
Earnings   147   218
Blaine, MN [Member]
       
Business Acquisition [Line Items]        
Acquisition Date       May 10, 2013
Rental Revenue   369   579
Earnings   161   256
Austin, Texas [Member]
       
Business Acquisition [Line Items]        
Acquisition Date       Jul. 09, 2013
Rental Revenue   1,098   1,098
Earnings   $ 297   $ 297