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Share and Unit-Based Plans - Compensation Cost (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Share and unit-based plans |  |
Compensation cost under share and unit-based plans | $ 18,815 us-gaap_AllocatedShareBasedCompensationExpense | $ 20,346 us-gaap_AllocatedShareBasedCompensationExpense
LTIP Units |  |
Share and unit-based plans |  |
Compensation cost under share and unit-based plans | 15,228 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember | 18,240 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember
Stock awards |  |
Share and unit-based plans |  |
Compensation cost under share and unit-based plans | 75 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_StockAwardsMember | 114 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_StockAwardsMember
Stock units |  |
Share and unit-based plans |  |
Compensation cost under share and unit-based plans | 3,197 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_StockUnitsMember | 1,682 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mac_StockUnitsMember
Stock options |  |
Share and unit-based plans |  |
Compensation cost under share and unit-based plans | 4 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 4 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Phantom stock units |  |
Share and unit-based plans |  |
Compensation cost under share and unit-based plans | $ 311 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | $ 306 us-gaap_AllocatedShareBasedCompensationExpense / 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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