XML 81 R71.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Share and Unit-Based Plans Share and Unit-Based Plans - LTIP units granted (Details) | 9 Months Ended
--- | ---
Sep. 30, 2018 $ / shares shares
LTIP Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Granted (in shares) | shares | 569,136
Average grant date fair value (in dollars per share) | $ / shares | $ 51.78
1/1/2018 | LTIP, Service-based | 12/31/2020 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Granted (in shares) | shares | 65,466
Average grant date fair value (in dollars per share) | $ / shares | $ 65.68
1/1/2018 | LTIP, Market-based | 12/31/2020 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Granted (in shares) | shares | 291,326
Average grant date fair value (in dollars per share) | $ / shares | $ 44.28
1/29/2018 | LTIP, Service-based | 12/31/2020 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Granted (in shares) | shares | 1,893
Average grant date fair value (in dollars per share) | $ / shares | $ 66.02
1/29/2018 | LTIP, Service-based | 2/1/2022 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Granted (in shares) | shares | 13,632
Average grant date fair value (in dollars per share) | $ / shares | $ 66.02
1/29/2018 | LTIP, Market-based | 12/31/2020 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Granted (in shares) | shares | 7,775
Average grant date fair value (in dollars per share) | $ / shares | $ 48.23
3/2/2018 | LTIP, Service-based | 3/2/2018 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Granted (in shares) | shares | 99,407
Average grant date fair value (in dollars per share) | $ / shares | $ 59.04
4/26/2018 | LTIP, Service-based | 4/26/2018 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Granted (in shares) | shares | 89,637
Average grant date fair value (in dollars per share) | $ / shares | $ 55.78

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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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_LongTermIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardDateAxis=mac_January12018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_VestingAxis=mac_December312020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_AwardDateAxis=mac_January292018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=mac_February12022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardDateAxis=mac_March22018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=mac_March22018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardDateAxis=mac_April262018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=mac_April262018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |