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Share and Unit-Based Plans: Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | $ 34,873 us-gaap_AllocatedShareBasedCompensationExpense | $ 28,122 us-gaap_AllocatedShareBasedCompensationExpense | $ 14,970 us-gaap_AllocatedShareBasedCompensationExpense
Additional compensation cost from modified terms of awards due to employee separations |  |  | 1,214 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
Capitalized share and unit-based compensation costs | 5,410 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount | 3,915 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount | 2,646 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
Stock awards |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 365 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_StockAwardsMember | 497 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_StockAwardsMember | 598 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_StockAwardsMember
Unrecognized compensation cost of share and unit-based plans | 248 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = mac_StockAwardsMember |  |
Stock units |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 4,689 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_StockUnitsMember | 3,839 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_StockUnitsMember | 3,379 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_StockUnitsMember
Unrecognized compensation cost of share and unit-based plans | 2,843 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = mac_StockUnitsMember |  |
LTIP units |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 28,598 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember | 22,778 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember | 9,436 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember
Number of awards with modified terms due to separation agreement |  |  | 20,000 mac_SharebasedCompensationArrangementbySharebasedPaymentAwardPlanModificationNumberofAwards / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember
Unrecognized compensation cost of share and unit-based plans | 2,751 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember |  |
SARs |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 583 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Number of awards with modified terms due to separation agreement |  |  | 54,405 mac_SharebasedCompensationArrangementbySharebasedPaymentAwardPlanModificationNumberofAwards / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Stock awards and units |  |  |
Share and unit-based plans |  |  |
Fair value of equity-based awards vested during period | 4,685 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = mac_StockAwardsAndStockUnitsMember | 3,516 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = mac_StockAwardsAndStockUnitsMember | 30,454 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = mac_StockAwardsAndStockUnitsMember
Stock options |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 16 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 16 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 21 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Unrecognized compensation cost of share and unit-based plans | 43 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Phantom stock units |  |  |
Share and unit-based plans |  |  |
Compensation cost under share and unit-based plans | 1,205 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 992 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 953 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
Unrecognized compensation cost of share and unit-based plans | $ 541 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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