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Acquisitions: Reconciliation of Purchase Price to Fair Value (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 03, 2012 | Oct. 26, 2012 | Oct. 24, 2013 | Jun. 04, 2014 | Nov. 14, 2014
Acquisition |  |  |  |  |  |  |  |
Less debt assumed | $ (1,414,659)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 | $ (257,064)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 | $ (420,123)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 |  |  |  |  |
Carrying value of investment | (984,132)us-gaap_EquityMethodInvestments | (701,483)us-gaap_EquityMethodInvestments |  |  |  |  |  |
Gain on remeasurement of assets | 1,423,136 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss | 51,205 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss | 199,956 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss |  |  |  |  |
FlatIron Crossing |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |
Purchase price |  |  |  | 310,397 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_FlatIronCrossingMember |  |  |  |
Less debt assumed |  |  |  | (114,497)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_FlatIronCrossingMember |  |  |  |
Carrying value of investment |  |  |  | (33,382)us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = mac_FlatIronCrossingMember |  |  |  |
Gain on remeasurement of assets |  |  |  | 84,227 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss / us-gaap_BusinessAcquisitionAxis = mac_FlatIronCrossingMember |  |  |  |
Less prior gain deferral |  |  |  | (26,067)us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsNetGainsAndLosses / us-gaap_BusinessAcquisitionAxis = mac_FlatIronCrossingMember |  |  |  |
Fair value of acquired net assets (at 100% ownership) |  |  |  | 287,442 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mac_FlatIronCrossingMember |  |  |  |
Arrowhead Towne Center |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | 144,400 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_ArrowheadTowneCenterMember |  |  |
Less debt assumed |  |  |  |  | (75,375)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_ArrowheadTowneCenterMember |  |  |
Carrying value of investment |  |  |  |  | (23,597)us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = mac_ArrowheadTowneCenterMember |  |  |
Gain on remeasurement of assets |  |  |  |  | 115,729 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss / us-gaap_BusinessAcquisitionAxis = mac_ArrowheadTowneCenterMember |  |  |
Fair value of acquired net assets (at 100% ownership) |  |  |  |  | 208,351 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mac_ArrowheadTowneCenterMember |  |  |
Superstition Springs Land I |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | 46,162 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_SuperstitionSpringsLandIMember |  |
Less debt assumed |  |  |  |  |  | (22,500)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_SuperstitionSpringsLandIMember |  |
Carrying value of investment |  |  |  |  |  | (32,476)us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = mac_SuperstitionSpringsLandIMember |  |
Gain on remeasurement of assets |  |  |  |  |  | 14,864 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss / us-gaap_BusinessAcquisitionAxis = mac_SuperstitionSpringsLandIMember |  |
Fair value of acquired net assets (at 100% ownership) |  |  |  |  |  | 71,002 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mac_SuperstitionSpringsLandIMember |  |
Cascade Mall |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | 15,233 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember |
Carrying value of investment |  |  |  |  |  |  | (15,767)us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember |
Fair value of acquired net assets (at 100% ownership) |  |  |  |  |  |  | 31,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember |
PPRLP Queens Portfolio |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  | 1,838,886 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Less debt assumed |  |  |  |  |  |  |  | (672,109)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Carrying value of investment |  |  |  |  |  |  |  | (208,735)us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Gain on remeasurement of assets |  |  |  |  |  |  |  | 1,423,136 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Fair value of acquired net assets (at 100% ownership) |  |  |  |  |  |  |  | $ 2,381,178 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The net gains or losses recognized for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities 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 (e)(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + 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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: 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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