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Equity Compensation Plans - Additional Information (Detail) (USD $) | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Apr. 05, 2011 | Oct. 29, 2013 Subsequent event | Jul. 29, 2013 Amended and Restated Equity Incentive Plan
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |
Common stock, shares issuable | 300,000,000 | 300,000,000 | 300,000,000 |  |  | 800,000
Shares issued to Directors |  |  |  | 3,000 | 9,000 |
Selling commissions | $ 0 | $ 0 |  |  |  |
Minimum proceeds from unaffiliated persons |  | $ 2,500 |  |  |  |

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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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- Definition Selling commissions and dealer manager fees paid for shares sold under distribution reinvestment program. + References No definition available. + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + 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 + Details
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