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Investments in Unconsolidated Joint Ventures: (Details 2) (USD $) | 12 Months Ended | 1 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Jun. 30, 2011 GGP Exchange store | Jun. 03, 2011 GGP Exchange | Jun. 30, 2011 Superstition Springs Land | Dec. 31, 2011 Superstition Springs Land | Jun. 03, 2011 Superstition Springs Land | Feb. 28, 2011 Desert Sky Mall squarefoot | Dec. 31, 2011 Desert Sky Mall | Dec. 31, 2011 Eastland Mall | Dec. 31, 2011 Lake Square Mall | Dec. 31, 2011 South Park Mall | Dec. 31, 2011 South Ridge Mall | Dec. 31, 2011 Northpark Mall | Dec. 31, 2011 Valley Mall | Jul. 31, 2009 Queens Center | Dec. 31, 2009 Queens Center | Sep. 30, 2009 FlatIron Crossing warrant | Dec. 31, 2009 FlatIron Crossing | Dec. 31, 2011 FlatIron Crossing | Feb. 28, 2011 Kierland Commons squarefoot | Dec. 31, 2011 Kierland Commons | Feb. 24, 2011 Kierland Commons | Feb. 28, 2011 The Shops at Atlas Park squarefoot | Dec. 31, 2011 SDG Macerich Properties, L. P. shoppingcenter | Apr. 30, 2011 SDG Macerich Properties, L. P. | Dec. 31, 2011 SDG Macerich Properties, L. P. shoppingcenter | Dec. 31, 2010 SDG Macerich Properties, L. P. | Dec. 31, 2009 SDG Macerich Properties, L. P. | Dec. 30, 2011 SDG Macerich Properties, L. P. | Jun. 30, 2011 Arrowhead Towne Center | Jun. 03, 2011 Arrowhead Towne Center | Jun. 30, 2011 Superstition Springs Center | Dec. 31, 2011 Superstition Springs Center | Jun. 03, 2011 Superstition Springs Center
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% | 49.00% | 75.00% | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received on sale of joint venture interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 152,654,000 |  | $ 123,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of investments in unconsolidated entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 154,156,000 | 154,156,000 | 2,506,000 | 2,506,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of interest in joint venture attributed to warrants issued |  |  | 14,503,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,068,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sale proceeds in excess of carrying amount of interest sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,720,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized gain on sale of joint venture interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,214,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage (in square feet) |  |  |  |  |  |  |  |  | 893,863 |  |  |  |  |  |  |  |  |  |  |  |  | 434,642 |  |  | 377,924 |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,550,000 | 53,750,000 |  |  |  |  |  |  |  |  |  |  |
Purchase price on acquisition |  |  |  |  |  |  |  |  | 27,625,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price paid in cash by the Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,161,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  |  |  | 75,000,000 |  |  |  | 1,875,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company | 192,566,000 |  |  |  |  |  |  |  | 25,750,000 |  |  |  |  |  |  |  |  |  |  |  |  | 18,613,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership before additional interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24.50% |  |  |  |  |  |  |  |  |  |  |  |
Number of Mervyn's stores exchanged |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  | 50.00% | 50.00% | 50.00% |  | 50.00% |  |  |  |  | 66.70% |  | 66.70% | 66.70%
Ownership percentage in joint ventures |  |  |  |  |  |  |  | 100.00% | 100.00% |  | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Other joint venture partners' ownership percentage in joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Remeasurement gain on acquisition of additional interest | 389,707,000 | 576,000 | (3,016,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,019,000 |  |  | 188,264 |  | 366,312,000 | 6,000 | (931,000) |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.30% |  | 33.30% |  |
Loan paid off |  |  |  |  |  |  |  |  | 51,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | $ 1,868,000 | $ 1,868,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |

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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 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 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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