Beneficial Interest in Debt and Interest Expense (Debt Covenants and Guarantees) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Guarantor Obligations [Line Items]
Restricted cash	$ 8.3	$ 7.6
Dolphin Mall [Member]
Guarantor Obligations [Line Items]
Loan balance	0
TRG's beneficial interest in loan balance	0
Amount of loan balance guaranteed by TRG	0
% of loan balance guaranteed by TRG (in hundredths)	100.00%
% of interest guaranteed by TRG (in hundredths)	100.00%
Fairlane Town Center [Member]
Guarantor Obligations [Line Items]
Loan balance	20.0
TRG's beneficial interest in loan balance	20.0
Amount of loan balance guaranteed by TRG	20.0
% of loan balance guaranteed by TRG (in hundredths)	100.00%
% of interest guaranteed by TRG (in hundredths)	100.00%
Twelve Oaks Mall [Member]
Guarantor Obligations [Line Items]
Loan balance	0
TRG's beneficial interest in loan balance	0
Amount of loan balance guaranteed by TRG	$ 0
% of loan balance guaranteed by TRG (in hundredths)	100.00%
% of interest guaranteed by TRG (in hundredths)	100.00%

The Operating Partnership's beneficial interest in the loan balance carried by the shopping center.

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- Definition

Percentage of interest on the loan balance carried by the shopping center, that is guaranteed by the Operating Partnership.

+ Details

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- Definition

Percentage of loan balance carried by the shopping center, that is guaranteed by the Operating Partnership.

+ Details

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- Definition

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9

-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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph c

-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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

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- Definition

The carrying amount of the outstanding balance due under the mortgage loan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674

+ Details

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