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Summary of Significant Accounting Policies - Acquisitions (Details) | 12 Months Ended
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Dec. 31, 2017 form
Accounting Policies [Abstract] |
Number of forms of in-place operating lease intangible assets and liabilities | 3

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- Definition Represents the number of forms that can be taken by the identifiable intangible assets and liabilities relating to in-place operating leases acquired. + References No definition available. + Details
Name: | mac_NumberOfFormsOfInPlaceOperatingLeases
Namespace Prefix: | mac_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration