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Balance of Investment in Joint Venture (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Capital Contributions, net of distributions	$ 5,155	$ 3,420
Equity in cumulative net loss	(1,093)	(259)
Investment in joint venture	$ 4,062	$ 3,161	[1]
[1] Derived from audited financial statements

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- Definition

Income (Loss) from Joint Venture

+ References

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- Definition

Investment In Significant Unconsolidated Joint Ventures

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- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

+ 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 210.5-02.12)

-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 12

-Article 5

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