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Employee Benefit Plans: (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 28, 2013 | Feb. 01, 1999
401(k) Plan |  |  |  |  |
Employee Benefit Plans: |  |  |  |  |
Number of common stock shares reserved for issuance (in shares) |  |  |  |  | 150,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_DefinedContributionPlanNameAxis = mac_DefinedContributionPlanMember
Number of additional common stock shares reserved for issuance (in shares) |  |  |  | 500,000 mac_CommonStockAdditionalCapitalSharesReservedForFutureIssuance / us-gaap_DefinedContributionPlanNameAxis = mac_DefinedContributionPlanMember |
Employer match of employee contributions of first 3% of eligible compensation (as a percent) | 100.00%mac_DefinedContributionPlanEmployerMatchLevelOne / us-gaap_DefinedContributionPlanNameAxis = mac_DefinedContributionPlanMember |  |  |  |
Percentage of eligible compensation, matched 100% by employer (as a percent) | 3.00%mac_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne / us-gaap_DefinedContributionPlanNameAxis = mac_DefinedContributionPlanMember |  |  |  |
Employer match of employee contributions of next 2% of eligible compensation (as a percent) | 50.00%mac_DefinedContributionPlanEmployerMatchLevelTwo / us-gaap_DefinedContributionPlanNameAxis = mac_DefinedContributionPlanMember |  |  |  |
Percentage of eligible compensation, matched 50% by employer (as a percent) | 2.00%mac_DefinedContributionPlanEmployerMatchEmployeeContributionLevelTwo / us-gaap_DefinedContributionPlanNameAxis = mac_DefinedContributionPlanMember |  |  |  |
Employer contribution | $ 3,253 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = mac_DefinedContributionPlanMember | $ 3,017 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = mac_DefinedContributionPlanMember | $ 3,094 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = mac_DefinedContributionPlanMember |  |
Deferred Compensation Plans |  |  |  |  |
Employee Benefit Plans: |  |  |  |  |
Employer contribution | $ 845 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = mac_DeferredCompensationPlansMember | $ 843 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = mac_DeferredCompensationPlansMember | $ 648 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = mac_DeferredCompensationPlansMember |  |

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- Definition Represents the number of additional common shares reserved for future issuance. + References No definition available. + Details
Name: | mac_CommonStockAdditionalCapitalSharesReservedForFutureIssuance
Namespace Prefix: | mac_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the first level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
Name: | mac_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne
Namespace Prefix: | mac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the second level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
Name: | mac_DefinedContributionPlanEmployerMatchEmployeeContributionLevelTwo
Namespace Prefix: | mac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the employer matching contribution of the first level of employee contributions. + References No definition available. + Details
Name: | mac_DefinedContributionPlanEmployerMatchLevelOne
Namespace Prefix: | mac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the employer matching contribution of the second level of employee contributions. + References No definition available. + Details
Name: | mac_DefinedContributionPlanEmployerMatchLevelTwo
Namespace Prefix: | mac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Aggregate number of common shares reserved for future issuance. + 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 + Details
Name: | us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DefinedContributionPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DefinedContributionPlanNameAxis=mac_DeferredCompensationPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DefinedContributionPlanNameAxis=mac_DefinedContributionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |