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Employee Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
The Plan |  |  |
Employee Benefit Plans: |  |  |
Number of common stock shares reserved for issuance (in shares) | 650,000 |  |
Employer match of employee contributions of first 3% of eligible compensation (as a percent) | 100.00% |  |
Percentage of eligible compensation, matched 100% by employer (as a percent) | 3.00% |  |
Employer match of employee contributions of next 2% of eligible compensation (as a percent) | 50.00% |  |
Percentage of eligible compensation, matched 50% by employer (as a percent) | 2.00% |  |
Employer contribution | $ 3,455 | $ 3,346 | $ 3,422
Deferred Compensation Plans |  |  |
Employee Benefit Plans: |  |  |
Employer contribution | $ 695 | $ 814 | $ 813

X
- 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

X
- 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

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&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 Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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