XML 68 R64.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Share and Unit-Based Plans - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Mar. 06, 2015 $ / shares shares | Jan. 01, 2015 $ / shares shares | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) $ / shares shares | Jun. 30, 2014 USD ($)
Share and unit-based plans |  |  |  |  |  |
Capitalized share and unit-based compensation costs | $ |  |  | $ 561 | $ 519 | $ 4,908 | $ 4,361
Stock units |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |
Conversion rate of shares |  |  |  |  | 1 |
Granted (in shares) |  |  |  |  | 76,340 |
Average grant date fair value (in dollars per share) | $ / shares |  |  |  |  | $ 86.64 |
Unrecognized compensation cost of share and unit-based plans | $ |  |  | 5,306 |  | $ 5,306 |
LTIP Units |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |
Conversion rate of shares |  |  |  |  | 1 |
Granted (in shares) |  |  |  |  | 368,508 |
Average grant date fair value (in dollars per share) | $ / shares |  |  |  |  | $ 75.98 |
Total stockholder return requirement (as a percent) |  |  |  |  | 3.00% |
Unrecognized compensation cost of share and unit-based plans | $ |  |  | 11,752 |  | $ 11,752 |
Stock awards |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 0 |
Average grant date fair value (in dollars per share) | $ / shares |  |  |  |  | $ 0.00 |
Unrecognized compensation cost of share and unit-based plans | $ |  |  | 75 |  | $ 75 |
Stock options |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |
Unrecognized compensation cost of share and unit-based plans | $ |  |  | 35 |  | $ 35 |
Phantom stock units |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 5,460 |
Average grant date fair value (in dollars per share) | $ / shares |  |  |  |  | $ 83.19 |
Unrecognized compensation cost of share and unit-based plans | $ |  |  | $ 268 |  | $ 268 |
Executive Officer | LTIP Units |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |
Average grant date fair value (in dollars per share) | $ / shares | $ 86.72 |  |  |  |  |
2016 LTIP Units Series 1 | Executive Officer | LTIP Units |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |
Granted (in shares) |  | 49,451 |  |  |  |
Average grant date fair value (in dollars per share) | $ / shares |  | $ 83.41 |  |  |  |
2015 LTIP Units Series 2 | Executive Officer | LTIP Units |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |
Granted (in shares) |  | 186,450 |  |  |  |
Average grant date fair value (in dollars per share) | $ / shares |  | $ 66.37 |  |  |  |
2015 LTIP Units Series 3 | Executive Officer | LTIP Units |  |  |  |  |  |
Share and unit-based plans |  |  |  |  |  |
Granted (in shares) | 132,607 |  |  |  |  |

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 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 Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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 (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 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_StockUnitsMember
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_StockAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PhantomShareUnitsPSUsMember
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: |

X
- Details
Name: | us-gaap_PlanNameAxis=mac_A2015LTIPUnitsSeries1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=mac_A2015LTIPUnitsSeries2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=mac_A2015LTIPUnitsSeries3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |