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
Mar. 31, 2014
Mar. 31, 2013
Business Acquisition [Line Items]    
Rental Revenue $ 14 $ 5
Earnings 9 3
Allen, TX [Member]
    
Business Acquisition [Line Items]    
Acquisition Date Mar. 27, 2014  
Rental Revenue 8  
Earnings 5  
Colleyville, TX [Member]
    
Business Acquisition [Line Items]    
Acquisition Date Mar. 27, 2014  
Rental Revenue 6  
Earnings 4  
Egg Harbor Township, NJ [Member]
    
Business Acquisition [Line Items]    
Acquisition Date   Mar. 28, 2013
Rental Revenue   5
Earnings   $ 3