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

X

- 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

X

- Details

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