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Noncontrolling Interests: (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Aug. 20, 2014 | Dec. 31, 2013 | Aug. 17, 2012
Noncontrolling Interest [Line Items] |  |  |  |
Limited partnership interest of the operating partnership (as a percent) | 6.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners |  | 7.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners |
Common stock, par value (in dollars per share) | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Number of trading days used to calculate redemption value | 10 days |  |  |
Redemption value of outstanding OP Units not owned by the Company | $ 877,184 mac_MinorityInterestRedemptionValue |  | $ 587,917 mac_MinorityInterestRedemptionValue |
The Macerich Partnership, L.P. |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Ownership interest in operating partnership (as a percent) | 94.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = mac_TheMacerichPartnershipLPMember |  | 93.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = mac_TheMacerichPartnershipLPMember |

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- Definition Face amount or stated value per share of common stock. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Details
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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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- Details
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