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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) |  |  |  |  |  |  |

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 + Details
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