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Noncontrolling Interests: (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Noncontrolling Interests:
Ownership interest in operating partnership (as a percent)	93.00%	93.00%
Limited partnership interest of the operating partnership (as a percent)	7.00%	7.00%
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Number of trading days used to calculate redemption value	10 days
Redemption value of outstanding OP Units not owned by the Company	$ 643,659	$ 586,409

X

- Definition

Represents the aggregate redemption value for the noncontrolling interest.

+ References

No definition available.

+ Details

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Namespace Prefix:	mac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the number of trading days prior to the balance sheet date over which the closing price per share of the entity's common stock is averaged to arrive at the redemption value per unit for the noncontrolling interest.

+ References

No definition available.

+ Details

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X

- Definition

Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-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=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

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Data Type:	num:perShareItemType
Balance Type:	na
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X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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