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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 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Real Estate Properties [Line Items]                            
Total revenue, as reported $ 4,787 $ 4,512 $ 4,041 $ 4,086 $ 3,990 $ 3,272 $ 3,222 $ 2,174   $ 14,175 $ 12,117 $ 16,629 $ 8,668 $ 5
Pro forma revenue                       18,308 17,675  
Net income (loss) allocable to common shares, as reported 255 (55) (28) (14) (26) (28) (48) 27 (63) 307 (68) (123) (112) 4
Pro forma net income (loss) allocable to common shares                       (66) (55)  
Pro Forma
                            
Real Estate Properties [Line Items]                            
Total revenue, as reported                   14,175 12,117      
Pro forma revenue                   16,017 15,290      
Net income (loss) allocable to common shares, as reported                   307 (68)      
Pro forma net income (loss) allocable to common shares                   $ 836 $ (1)