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Basis of Preparation (Details)	1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 29, 2012	Sep. 30, 2012	Sep. 30, 2012 item
Joint Venture disclosures
Number of joint ventures in which company has controlling interest			2
Tenancy in common interest (as a percent)		50.00%
Ownership percentage in VIE's	90.00%
Number of other unconsolidated joint ventures			5
Unconsolidated JV in Plano, Texas
Joint Venture disclosures
Ownership percentage in VIE's	90.00%
Consolidated JV one
Joint Venture disclosures
Ownership interest in consolidated joint venture (as a percent)		90.00%	90.00%
Consolidated JV two
Joint Venture disclosures
Ownership interest in consolidated joint venture (as a percent)		95.00%	95.00%

X

- Definition

Represents the number of joint ventures in which entity has controlling interest.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of unconsolidated joint ventures of the entity that are not separately disclosed within the note disclosures.

+ References

No definition available.

+ Details

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X

- Definition

Represents the tenancy in common interest accounted for as an undivided interest in the assets, liabilities, revenues and expenses of the tenancy in common, expressed as a percentage.

+ References

No definition available.

+ Details

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X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 5A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7880789&loc=SL6759159-111685

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