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Investments in Unconsolidated Joint Ventures: (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011 | Jun. 30, 2011 GGP Exchange store | Jun. 03, 2011 GGP Exchange | Jun. 30, 2011 Superstition Springs Land | Jun. 03, 2011 Superstition Springs Land | Feb. 28, 2011 Desert Sky Mall squarefoot | Mar. 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 | Feb. 28, 2011 Kierland Commons squarefoot | Mar. 31, 2012 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. | Mar. 31, 2012 SDG Macerich Properties, L. P. shoppingcenter | 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 | Mar. 31, 2012 Superstition Springs Center | Jun. 03, 2011 Superstition Springs Center | Mar. 31, 2012 Chandler Village Center, LLC squarefoot | Mar. 30, 2012 Chandler Village Center, LLC | Mar. 31, 2012 Chandler Festival squarefoot | Mar. 30, 2012 Chandler Festival | Mar. 31, 2012 SanTan Village Power Center squarefoot
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage |  |  |  |  |  |  | 893,863 |  |  |  |  |  |  |  | 434,642 |  |  | 377,924 |  |  |  |  |  |  |  |  |  | 273,439 |  | 500,426 |  | 491,037
Total purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 105,550 | $ 53,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price on acquisition |  |  |  |  |  |  | 27,625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price paid in cash by the Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,161 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  |  | 75,000 |  |  | 1,875 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  | 51,500 |  |  |  |  | 25,750 |  |  |  |  |  |  |  | 18,613 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership before additional interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Mervyn's stores exchanged |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  | 66.70% |  | 66.70% | 66.70% |  |  |  |  |
Ownership percentage in joint ventures |  |  |  |  |  | 100.00% | 100.00% | 50.00% | 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 | 22,990 | 24,874 |  |  |  |  |  | 1,838 |  |  |  |  |  |  |  | 25,019 |  |  | 188,264 |  |  |  |  |  |  |  |  |  |  |  |  |
Remeasurement gain on acquisition of additional interest, pro rata share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,510 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's share of total purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,875 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest acquired (as a percent) |  |  |  |  | 50.00% |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.30% |  | 33.30% |  |  |  |  |  |  |
Loan paid off |  |  |  |  |  |  | 51,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,000
Share of gain on conveyance of Granite Run Mall through deed-in-lieu foreclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,753 |  |  |  |  |  |  |  |  |  |  |  |
Number of anchor locations exchanged |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on purchase of remaining interest in property |  |  |  |  | 1,734 |  | 1,838 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |
Consideration received on sale of joint venture interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,795 |  | 30,975 |  |
Gain on sale of investments in unconsolidated entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,214 |  | 12,337 |  |
Cash proceeds for sale of interest in property | 23,180 | 4,785 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,045 |  | 16,183 |  |
Sale consideration including assumption of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,750 |  | 14,792 |
Proceeds from sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54,780
Gain on sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,330
Gain on sale of property, pro rata share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,520
Cash distributed to the partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,780
Gain on sale of property, pro rata share included in net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,571

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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 Gain (loss) recognized on the sale of oil and gas property or timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + 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 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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