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Pro Forma of Financial Information Purport to Represent Results of Operations for Future Periods (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
Real Estate Properties [Line Items]        
Total revenue, as reported $ 4,700 $ 4,086 $ 9,388 $ 8,076
Net income (loss) allocable to common shares, as reported 48 (14) 52 (40)
Pro Forma
        
Real Estate Properties [Line Items]        
Total revenue, as reported   4,086   8,076
Pro forma revenue   4,625   9,154
Net income (loss) allocable to common shares, as reported   (14)   (40)
Pro forma net income (loss) allocable to common shares   $ (12)   $ (43)