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Co-Venture Arrangement: (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Sep. 30, 2009	Mar. 31, 2015	Dec. 31, 2014
Co-Venture Arrangement:
Co-venture obligation		$ 72,864us-gaap_DeferredGainOnSaleOfProperty	$ 75,450us-gaap_DeferredGainOnSaleOfProperty
Freehold Raceway Mall and Chandler Fashion Center
Co-Venture Arrangement:
Percentage of loan assumed by third party (as a percent)	49.90%mac_JointVentureOwnershipPercentageSold / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Co-venture obligation	$ 168,154us-gaap_DeferredGainOnSaleOfProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Freehold Raceway Mall
Co-Venture Arrangement:
Property area (in square feet)	1,668,000us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_FreeholdRacewayMallMember
Chandler Fashion Center
Co-Venture Arrangement:
Property area (in square feet)	1,320,000us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = mac_ChandlerFashionCenterMember

X

- Definition

The percentage of ownership interest in the joint venture sold by the entity during the period.

+ References

No definition available.

+ Details

Name:	mac_JointVentureOwnershipPercentageSold
Namespace Prefix:	mac_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	mac_ScheduleOfJointVenturesLineItems
Namespace Prefix:	mac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 40

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.U.Q2)

-URI http://asc.fasb.org/extlink&oid=6955272&loc=d3e221323-122791

+ Details

Name:	us-gaap_DeferredGainOnSaleOfProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=mac_ChandlerFashionCenterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=mac_FreeholdRacewayMallAndChandlerFashionCenterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=mac_FreeholdRacewayMallMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: