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Investments in Unconsolidated Joint Ventures: (Details) (USD $) | 3 Months Ended | 6 Months Ended | 1 Months Ended |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 6 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2011 GGP Exchange store | Jun. 03, 2011 GGP Exchange | Jun. 30, 2011 Superstition Springs Land | Jun. 30, 2011 Superstition Springs Land | Jun. 30, 2011 Superstition Springs Land | Jun. 03, 2011 Superstition Springs Land | Feb. 28, 2011 Desert Sky Mall squarefoot | Jun. 30, 2011 Desert Sky Mall | Dec. 31, 2011 Eastland Mall | Dec. 31, 2011 Lake Square Mall | Dec. 31, 2011 SouthPark Mall | Dec. 31, 2011 Southridge Mall | Dec. 31, 2011 NorthPark Mall | Dec. 31, 2011 Valley Mall | Feb. 28, 2011 Kierland Commons Investment LLC | Feb. 24, 2011 Kierland Commons Investment LLC | Feb. 28, 2011 Kierland Commons Investment LLC Kierland Commons squarefoot | Feb. 24, 2011 Kierland Commons Investment LLC Kierland Commons | Feb. 28, 2011 The Shops at Atlas Park squarefoot | Dec. 31, 2011 SDG Macerich Properties, L. P. item | Apr. 30, 2011 SDG Macerich Properties, L. P. | Dec. 30, 2011 SDG Macerich Properties, L. P. | Jun. 30, 2011 Arrowhead Towne Center | Jun. 30, 2012 Arrowhead Towne Center | Jun. 03, 2011 Arrowhead Towne Center | Jun. 30, 2011 Superstition Springs Center | Jun. 30, 2012 Superstition Springs Center | Jun. 03, 2011 Superstition Springs Center | Mar. 31, 2012 Chandler Village Center, LLC squarefoot | Jun. 30, 2012 Chandler Village Center, LLC | Mar. 31, 2012 Chandler Festival squarefoot | Jun. 30, 2012 Chandler Festival | Mar. 31, 2012 SanTan Village Power Center squarefoot | May 31, 2012 Chandler Gateway squarefoot | Jun. 30, 2012 Chandler Gateway
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage |  |  |  |  |  |  |  |  |  |  | 893,863 |  |  |  |  |  |  |  |  |  | 434,642 |  | 377,924 |  |  |  |  |  |  |  |  |  | 273,439 |  | 500,426 |  | 491,037 | 259,535 |
Total purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 105,550,000 | $ 53,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price on acquisition |  |  |  |  |  |  |  |  |  |  | 27,625,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price paid in cash by the Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,162,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  |  |  |  | 75,000,000 |  |  |  |  | 1,875,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  |  |  | 56,900,000 |  |  |  |  |  |  | 25,750,000 |  |  |  |  |  |  |  |  |  | 18,613,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership before additional interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership by all joint venture partners before additional interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Mervyn's stores exchanged |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  | 50.00% |  |  | 50.00% |  | 66.70% | 66.70% |  | 66.70% | 66.70% |  |  |  |  |  |  |
Total ownership percentage acquired by all joint venture partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in property on completion of acquisition |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other joint venture partners' ownership percentage in joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale or remeasurement of assets | (24,000) | (329,000) | 22,966,000 | 24,545,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,019,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,307,000 |  |
Remeasurement gain on acquisition of additional interest, pro rata share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,510,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's share of total purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,875,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest acquired (as a percent) |  |  |  |  |  |  | 50.00% |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.30% |  |  | 33.30% |  |  |  |  |  |  |  |  |
Loan paid off |  |  |  |  |  |  |  |  |  |  | 51,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,000,000 |  |
Share of gain on conveyance of Granite Run Mall through deed-in-lieu foreclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,753,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of anchor locations exchanged |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on purchase of remaining interest in property |  |  |  |  |  |  | 1,734,000 | 1,734,000 | 1,734,000 |  | 1,838,000 | 1,838,000 |  |  |  |  |  |  |  |  |  |  |  | 188,264,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of regional shopping centers owned by investee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets distributed to the Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of regional malls distributed by the investee to the outside partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  | 50.00% |  |  | 50.00% |
Consideration received on sale of joint venture interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,795,000 |  | 30,975,000 |  |  | 14,315,000 |
Gain on sale of investments in unconsolidated entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,188,000 |  | 12,347,000 |  |  | 3,345,000
Cash proceeds for sale of interest in property |  |  | 130,645,000 | 4,875,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,045,000 |  | 16,183,000 |  |  | 4,921,000 |
Mortgage note assumed by purchaser as sale consideration |  |  | 185,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,750,000 |  | 14,792,000 |  |  | 9,394,000 |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54,780,000 |  |
Gain on sale of property, pro rata share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,508,000 |  |
Cash distributed to the partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,780,000 |  |
Gain on sale of property, pro rata share included in net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,567,000 |  |

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- Definition The loss or gain included in earnings during the period resulting from the disposal of an asset through a means other than through sale, such as abandonment, spin-off, and expropriation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 27, 28 -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 Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6390789&loc=d3e2611-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6390744&loc=d3e2212-110226 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -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 AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -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 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition This item represents the amount of gain (loss) arising from the disposal of an equity method investment. + References No definition available. + Details
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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -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 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The value of notes retired (or transferred to another entity) in noncash investing or financing transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -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 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b -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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
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- Definition The amount of square footage related to a real estate property. + References No definition available. + Details
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