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Summary of Significant Accounting Policies: Revenues (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues      
Increase in minimum rent due to straight-line rent adjustment $ 5,825us-gaap_StraightLineRent $ 7,498us-gaap_StraightLineRent $ 5,399us-gaap_StraightLineRent
Minimum      
Revenues      
Management fees as a percentage of gross monthly rental revenue 1.50%mac_ManagementFeeRevenueAsPercentageOfGrossMonthlyRentalRevenue
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum      
Revenues      
Management fees as a percentage of gross monthly rental revenue 5.00%mac_ManagementFeeRevenueAsPercentageOfGrossMonthlyRentalRevenue
/ us-gaap_RangeAxis
= us-gaap_MaximumMember