Represents the number of additional common shares reserved for future issuance.

No definition available.

Name:	mac_CommonStockAdditionalCapitalSharesReservedForFutureIssuance
Namespace Prefix:	mac_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the first level of employee contributions (percentage of compensation) which are matched by the employer.

+ References

No definition available.

+ Details

Name:	mac_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne
Namespace Prefix:	mac_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the second level of employee contributions (percentage of compensation) which are matched by the employer.

+ References

No definition available.

+ Details

Name:	mac_DefinedContributionPlanEmployerMatchEmployeeContributionLevelTwo
Namespace Prefix:	mac_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the employer matching contribution of the first level of employee contributions.

+ References

No definition available.

+ Details

Name:	mac_DefinedContributionPlanEmployerMatchLevelOne
Namespace Prefix:	mac_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the employer matching contribution of the second level of employee contributions.

+ References

No definition available.

+ Details

Name:	mac_DefinedContributionPlanEmployerMatchLevelTwo
Namespace Prefix:	mac_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: 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

+ Details

Name:	us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

- Details

Name:	us-gaap_DefinedContributionPlanNameAxis=mac_DeferredCompensationPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedContributionPlanNameAxis=mac_DefinedContributionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Employee Benefit Plans: (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 28, 2013	Feb. 01, 1999
401(k) Plan
Employee Benefit Plans:
Number of common stock shares reserved for issuance (in shares)					150,000
Number of additional common stock shares reserved for issuance (in shares)				500,000
Employer match of employee contributions of first 3% of eligible compensation (as a percent)	100.00%
Percentage of eligible compensation, matched 100% by employer (as a percent)	3.00%
Employer match of employee contributions of next 2% of eligible compensation (as a percent)	50.00%
Percentage of eligible compensation, matched 50% by employer (as a percent)	2.00%
Employer contribution	$ 3,253	$ 3,017	$ 3,094
Deferred Compensation Plans
Employee Benefit Plans:
Employer contribution	$ 845	$ 843	$ 648