XML 58 R83.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Share and Unit-Based Plans: Long-Term Incentive Plan Units (Details) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 11, 2013 | Jan. 31, 2013 | Jan. 16, 2013 | Jan. 12, 2015 | Mar. 07, 2014 | Sep. 01, 2013 | Feb. 15, 2013 | Apr. 16, 2012 | Feb. 23, 2012 | Dec. 31, 2013
Stock units |  |  |  |  |  |  |  |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate | 1 mac_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConversionRate / us-gaap_AwardTypeAxis = mac_StockUnitsMember |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 75,309 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = mac_StockUnitsMember | 67,920 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = mac_StockUnitsMember | 72,322 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = mac_StockUnitsMember |  |  |  |  |  |  |  |  |  |
Granted (in shares) | $ 60.50 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mac_StockUnitsMember | $ 62.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mac_StockUnitsMember | $ 54.43 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mac_StockUnitsMember |  |  |  |  |  |  |  |  |  |
Vested (in shares) | 68,253 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = mac_StockUnitsMember | 45,279 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = mac_StockUnitsMember | 533,985 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = mac_StockUnitsMember |  |  |  |  |  |  |  |  |  |
LTIP units |  |  |  |  |  |  |  |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate | 1 mac_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConversionRate / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 725,908 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember | 332,189 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember | 315,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember |  |  |  |  |  |  |  |  |  |
Granted (in shares) | $ 51.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember | $ 66.58 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember | $ 40.53 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember |  |  |  |  |  |  |  |  |  |
Absolute return requirement (in shares) | 3.00%mac_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsotherthanOptionsAbsoluteReturnRequirement / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember |  |  |  |  |  |  |  |  |  |  |  |
Level of percentile ranking at which awards vested (as a percent) |  |  |  | 100.00%mac_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPercentileRankingOfAwardsVestedInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember |  | 96.00%mac_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPercentileRankingOfAwardsVestedInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember |  |  |  |  |  |  |
Vested (in shares) | 679,213 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember | 518,900 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember | 305,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember |  | 200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember | 318,900 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember |  |  |  |  |  |  |
Forfeited (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember | 13,289 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember |  |  | 13,289 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember |  |  |  |  |  |  |
LTIP units | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |  |  |  |  |  |  |  |
Level of percentile ranking at which awards vested (as a percent) |  |  |  |  |  |  | 150.00%mac_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPercentileRankingOfAwardsVestedInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |
Long Term Incentive Plan, Market Indexed |  |  |  |  |  |  |  |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) | 136,465 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMarketIndexedMember |  |  |  |  |  |  |  |  |  |  |  |
Executive Officer | LTIP units |  |  |  |  |  |  |  |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  | 20,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember | 332,189 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember | 10,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember | 190,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember |
Granted (in shares) |  |  |  |  |  |  |  | $ 60.25 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember | $ 59.57 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember | $ 66.58 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember | $ 54.97 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember | $ 37.77 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember |
Executive Officer | LTIP units | 2014 LTIP Units Series 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 246,471 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_PlanNameAxis = mac_A2014LTIPUnitsSeries1Member / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember |  |  |  |  | 272,930 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_PlanNameAxis = mac_A2014LTIPUnitsSeries1Member / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | $ 45.34 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_PlanNameAxis = mac_A2014LTIPUnitsSeries1Member / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember
Executive Officer | LTIP units | 2014 LTIP Units Series 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 70,042 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_PlanNameAxis = mac_A2014LTIPUnitsSeries2Member / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | $ 58.89 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mac_LongTermIncentivePlanMember / us-gaap_PlanNameAxis = mac_A2014LTIPUnitsSeries2Member / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments other than Options, Absolute Return Requirement + References No definition available. + Details
Name: | mac_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsotherthanOptionsAbsoluteReturnRequirement
Namespace Prefix: | mac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments, Other than Options, Conversion Rate + References No definition available. + Details
Name: | mac_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsConversionRate
Namespace Prefix: | mac_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the level of percentile ranking terms of total return per common stock share to the total return of a group of peer REITs at which the equity instruments other than options vested during the period. + References No definition available. + Details
Name: | mac_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPercentileRankingOfAwardsVestedInPeriod
Namespace Prefix: | mac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_AwardTypeAxis=mac_LongTermIncentivePlanMarketIndexedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=mac_LongTermIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=mac_StockUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_ExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |