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Acquisitions - Reconciliation of Purchase Price (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jun. 04, 2014	Nov. 14, 2014	Feb. 17, 2015	Dec. 31, 2014
Acquisition
Gain on remeasurement of assets	$ (1,006,652)us-gaap_EquityMethodInvestments					$ (984,132)us-gaap_EquityMethodInvestments
Gain on remeasurement of assets	22,103us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss	0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss
Cascade Mall
Acquisition
Purchase price			15,233us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember
Gain on remeasurement of assets			(15,767)us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember
Fair value of acquired net assets (at 100% ownership)			31,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember
Ownership interest at completion of acquisition (as a percent)			100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mac_CascadeMallMember
PPRLP Queens Portfolio
Acquisition
Purchase price				1,838,886us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Gain on remeasurement of assets				(208,735)us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Less debt assumed				(672,109)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Gain on remeasurement of assets				1,423,136us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Fair value of acquired net assets (at 100% ownership)				2,381,178us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Ownership interest at completion of acquisition (as a percent)				100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mac_PPRLPQueensPortfolioMember
Inland Center
Acquisition
Purchase price			51,250us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember		51,250us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember
Gain on remeasurement of assets			(4,147)us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember
Less debt assumed			(25,000)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember		(25,000)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember
Gain on remeasurement of assets			22,103us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember
Fair value of acquired net assets (at 100% ownership)			$ 52,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember
Ownership interest at completion of acquisition (as a percent)			100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mac_InlandCenterMember

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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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.

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