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Income Taxes: (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Common stock dividend distribution |  |  |
Ordinary income (in dollars per share) | $ 1.92 mac_CommonStockDividendsOrdinaryIncomePerShare | $ 1.02 mac_CommonStockDividendsOrdinaryIncomePerShare | $ 0.74 mac_CommonStockDividendsOrdinaryIncomePerShare
Capital gains (in dollars per share) | $ 0.16 mac_CommonStockDividendsCapitalGainDistributionPerShare | $ 1.24 mac_CommonStockDividendsCapitalGainDistributionPerShare | $ 1.13 mac_CommonStockDividendsCapitalGainDistributionPerShare
Unrecaptured Section 1250 gain (in dollars per share) | $ 0.05 mac_CommonStockDividendsUnrecapturedSection1250GainDistributionPerShare | $ 0.10 mac_CommonStockDividendsUnrecapturedSection1250GainDistributionPerShare | $ 0.36 mac_CommonStockDividendsUnrecapturedSection1250GainDistributionPerShare
Return of capital (in dollars per share) | $ 0.38 mac_CommonStockDividendsReturnOfCapitalDistributionPerShare | $ 0.00 mac_CommonStockDividendsReturnOfCapitalDistributionPerShare | $ 0.00 mac_CommonStockDividendsReturnOfCapitalDistributionPerShare
Dividends paid (in dollars per share) | $ 2.51 us-gaap_CommonStockDividendsPerShareCashPaid | $ 2.36 us-gaap_CommonStockDividendsPerShareCashPaid | $ 2.23 us-gaap_CommonStockDividendsPerShareCashPaid
Ordinary income (as a percent) | 76.50%mac_CommonStockDividendsOrdinaryIncomePercentage | 43.30%mac_CommonStockDividendsOrdinaryIncomePercentage | 33.20%mac_CommonStockDividendsOrdinaryIncomePercentage
Capital gains (as a percent) | 6.40%mac_CommonStockDividendsCapitalGainDistributionPercentage | 52.50%mac_CommonStockDividendsCapitalGainDistributionPercentage | 50.70%mac_CommonStockDividendsCapitalGainDistributionPercentage
Unrecaptured Section 1250 gain (as a percent) | 2.00%mac_CommonStockDividendsUnrecapturedSection1250GainDistributionPercentage | 4.20%mac_CommonStockDividendsUnrecapturedSection1250GainDistributionPercentage | 16.10%mac_CommonStockDividendsUnrecapturedSection1250GainDistributionPercentage
Return of capital (as a percent) | 15.10%mac_CommonStockDividendsReturnOfCapitalDistributionPercentage | 0.00%mac_CommonStockDividendsReturnOfCapitalDistributionPercentage | 0.00%mac_CommonStockDividendsReturnOfCapitalDistributionPercentage
Dividends paid (as a percent) | 100.00%mac_CommonStockDividendsCashPaidPercentage | 100.00%mac_CommonStockDividendsCashPaidPercentage | 100.00%mac_CommonStockDividendsCashPaidPercentage
Income tax benefit |  |  |
Current | $ 0 us-gaap_CurrentIncomeTaxExpenseBenefit | $ (142)us-gaap_CurrentIncomeTaxExpenseBenefit | $ 0 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred | 4,269 us-gaap_DeferredIncomeTaxExpenseBenefit | 1,834 us-gaap_DeferredIncomeTaxExpenseBenefit | 4,159 us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax benefit | 4,269 us-gaap_IncomeTaxExpenseBenefit | 1,692 us-gaap_IncomeTaxExpenseBenefit | 4,159 us-gaap_IncomeTaxExpenseBenefit
Reconciliation of income tax benefit (provision) of the TRSs |  |  |
Book loss for TRSs | 10,785 mac_BookIncomeLossForTRS | 11,709 mac_BookIncomeLossForTRS | 16,154 mac_BookIncomeLossForTRS
Tax at statutory rate on earnings from continuing operations before income taxes | 3,667 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 3,981 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 5,493 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Other | 602 us-gaap_IncomeTaxReconciliationOtherAdjustments | (2,289)us-gaap_IncomeTaxReconciliationOtherAdjustments | (1,334)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax benefit | 4,269 us-gaap_IncomeTaxExpenseBenefit | 1,692 us-gaap_IncomeTaxExpenseBenefit | 4,159 us-gaap_IncomeTaxExpenseBenefit
Components of net deferred tax assets |  |  |
Net operating loss carryforwards | 24,698 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 26,394 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Property, primarily differences in depreciation and amortization, the tax basis of land assets and treatment of certain other costs | 8,201 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 3,673 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Other | 2,726 mac_DeferredTaxAssetsLiabilitiesOther | 1,289 mac_DeferredTaxAssetsLiabilitiesOther |
Deferred tax assets | $ 35,625 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 31,356 us-gaap_DeferredTaxAssetsLiabilitiesNet |

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