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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

X

- Definition

Minimum gross offering proceeds from unaffiliated persons to be raised for shares issuance under independent directors compensation plan.

+ References

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- Definition

Selling commissions and dealer manager fees paid for shares sold under distribution reinvestment program.

+ References

No definition available.

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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

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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

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