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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 12 Months Ended
Mar. 31, 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
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Real Estate Properties [Line Items]                        
Total revenue, as reported $ 4,688 $ 4,512 $ 4,041 $ 4,086 $ 3,990 $ 3,272 $ 3,222 $ 2,174   $ 16,629 $ 8,668 $ 5
Pro forma revenue                   18,308 17,675  
Net income (loss) allocable to common shares, as reported 4 (55) (28) (14) (26) (28) (48) 27 (63) (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         3,990              
Pro forma revenue         4,529              
Net income (loss) allocable to common shares, as reported         (26)              
Pro forma net income (loss) allocable to common shares         $ (23)