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Summary of Significant Accounting Policies: (Details 3) (Customer concentration, Total revenues) | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
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Customer concentration | Total revenues |  |  |
Concentration of risk |  |  |
Threshold percentage for disclosure of revenues from a single client | 10.00% | 10.00% | 10.00%

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- Definition Threshold percentage which the entity uses for disclosure. + References No definition available. + Details
Name: | mac_ThresholdForDisclosurePercentage
Namespace Prefix: | mac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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