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Subsequent Events - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended
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Mar. 31, 2013 Property | Mar. 31, 2012 | Dec. 31, 2012 Property | Dec. 31, 2011 | Dec. 31, 2010 | May 07, 2013 Subsequent Event Property | Jul. 25, 2013 Subsequent Event | Jul. 25, 2013 Subsequent Event Base Management Fees [Member] | May 07, 2013 Subsequent Event if pre-incentive fee Core FFO does not exceed hurdle rate | May 07, 2013 Subsequent Event if pre-incentive fee Core FFO does not exceed hurdle rate Maximum | May 07, 2013 Subsequent Event if pre-incentive fee Core FFO exceeds hurdle rate | May 07, 2013 Subsequent Event if pre-incentive fee Core FFO exceeds hurdle rate Minimum | May 07, 2013 Subsequent Event Subsidiaries
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued in exchange for limited partnership interest |  |  |  |  |  |  |  |  |  |  |  |  | 5,274,900
Limited partnership interest received in exchange for issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  | 5,274,900
Annual Management fee as percentage of average real estate assets |  |  |  |  |  | 0.75% |  |  |  |  |  |  |
Number of multifamily property owned | 8 |  | 8 |  |  | 8 |  |  |  |  |  |  |
Quarterly management fee payment rate as percentage of average real estate assets |  |  |  |  |  | 0.1875% |  |  |  |  |  |  |
Cumulative gross amount of equity capital, hurdle rate |  |  |  |  |  |  |  |  |  | 1.75% |  | 1.75% |
Cumulative gross amount of equity capital, annual hurdle rate |  |  |  |  |  |  |  |  |  | 7.00% |  | 7.00% |
Advisor incentive fee |  |  |  |  |  |  |  |  | 0.00% |  | 20.00% |  |
Asset management fees | $ 82 | $ 53 | $ 240 | $ 9 | $ 0 |  |  | $ 0 |  |  |  |  |
Transfer agent costs to be reimbursed |  |  |  |  |  |  | $ 132 |  |  |  |  |  |

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- Definition Management Fee Bases Per Annum + References No definition available. + Details
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- Definition Percentage Of Management Fee + References No definition available. + Details
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- Definition The aggregate costs related to asset management during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition The number of units converted into shares of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 16 -Subparagraph a, b -Article 6 + Details
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