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Acquisitions (Summary) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  |  | 12 Months Ended |  |  |  |  | 1 Months Ended |  |  |  |  |  |
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Mar. 31, 2013 | Dec. 31, 2012 | Dec. 10, 2012 | Dec. 31, 2011 | Dec. 31, 2013 CBL & Associates Properties, Inc. [Member] | Dec. 31, 2012 CBL & Associates Properties, Inc. [Member] | Dec. 31, 2011 CBL & Associates Properties, Inc. [Member] | Apr. 30, 2013 Kirkwood Mall [Member] | Dec. 31, 2012 Kirkwood Mall [Member] | May 31, 2012 Dakota Square Mall [Member] | Apr. 30, 2012 Outlet Shoppes at Gettysburg [Member] | Apr. 30, 2012 Outlet Shoppes at Gettysburg [Member] CBL & Associates Properties, Inc. [Member] | Apr. 30, 2012 El Paso Outlet Outparcel Land [Member] | Apr. 30, 2012 Outlet Shoppes at El Paso and El Paso Outparcels [Member] | Apr. 30, 2012 Outlet Shoppes at El Paso [Member] | Apr. 30, 2012 Outlet Shoppes at El Paso [Member] CBL & Associates Properties, Inc. [Member] | Dec. 31, 2012 Imperial Valley Mall [Member] joint_venture | Sep. 30, 2011 Northgate Mall [Member] | Apr. 30, 2012 El Paso Outlet Shopping Center [Member] | Apr. 30, 2013 Kirkwood Mall Mezz, LLC [Member] | Dec. 31, 2012 Kirkwood Mall Mezz, LLC [Member] | Dec. 27, 2012 Kirkwood Mall Mezz, LLC [Member] | Apr. 30, 2012 Outlet Shoppes at El Paso [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, ownership percentage |  |  | 30.00% |  |  |  |  | 51.00% | 49.00% | 100.00% | 50.00% |  | 50.00% |  | 75.00% |  | 40.00% | 100.00% |  |  |  | 49.00% | 75.00%
Business combination, purchase price |  | $ 127,706 |  | $ 11,500 |  |  |  |  |  |  |  |  |  | $ 116,775 |  |  |  |  |  | $ 121,500 |  |  |
Mortgage note payables assumed |  | (259,470) |  | 0 |  |  |  |  |  |  |  |  |  | 66,924 | 5,775 |  |  |  |  |  | 40,368 |  |
Business combination, cash paid |  | 123,184 |  |  |  |  |  | 41,378 | 39,754 | 32,474 | 0 |  | 3,864 |  | 35,456 |  | 15,500 | 11,500 | 31,592 |  |  |  |
Business combination, debt assumed |  | 170,308 |  |  |  |  |  | 20,587 | 19,781 | 59,001 | 40,631 | 20,315 |  |  | 50,193 |  | 21,018 | 0 |  |  |  |  |
Business combination, other |  | 4,522 |  |  |  |  |  | 0 | 0 | 0 | 4,522 |  |  |  | 0 |  | 0 | 0 |  |  |  |  |
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds |  | 298,014 |  |  |  |  |  | 61,965 | 59,535 | 91,475 | 24,837 |  |  |  | 85,649 |  | 36,518 | 11,500 |  |  |  |  |
Business combination, remeasurement gain recognized on interest owned prior to acquisition |  |  |  |  | 2,400 | 45,072 | 0 |  |  |  |  |  |  |  |  |  | 45,072 |  |  |  |  |  |
Number of joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Fixed interest, percentage rate |  |  |  |  |  |  |  |  | 5.75% | 6.23% | 5.87% |  |  | 7.06% |  |  |  |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Mortgage Notes Payable Premium |  |  |  |  |  |  |  |  |  | 3,040 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net |  |  |  |  | (5,689) |  |  |  | 2,970 |  |  |  |  | 7,700 |  |  |  |  |  |  |  |  |
Business Acquisition Mortgage Notes Payable Fair Value Interest Rate Assumed Percentage |  |  |  |  |  |  |  |  | 4.25% | 4.75% |  |  |  |  | 4.75% |  |  |  |  |  |  |  |
Proceeds from loan repaid by acquiree | 3,525 |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,150 | 6,862 |  |  |  |  |  |  |
Payments to acquire entity, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28,594 |  |  |  |  |  |  |  |

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- Definition The interest rate used to calculate the premium or discount acquired on assumed debt of a business combination. + References No definition available. + Details
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- Definition The amount of acquisition cost of a business combination allocated to mortgage notes payable as a premium for above market interest rates of notes payable assumed from the acquired entity. + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Conversion of Debt to Equity + References No definition available. + Details
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- Definition Number of Joint Ventures + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28567-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
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