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Equity Compensation Plans - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Apr. 05, 2011
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Shares issued to Directors |  |  | 3,000
Minimum proceeds from unaffiliated persons | $ 2,500 | $ 2,500 |
Selling commissions | $ 0 | $ 0 |

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- Definition Minimum gross offering proceeds from unaffiliated persons to be raised for shares issuance under independent directors compensation plan. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Selling commissions and dealer manager fees paid for shares sold under distribution reinvestment program. + References No definition available. + Details
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- Details
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- Definition The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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