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Summary of Significant Accounting Policies: Investment in Unconsolidated Joint Ventures (Details)
12 Months Ended
Dec. 31, 2014
Investment in unconsolidated joint ventures  
Threshold ownership percentage above which to use equity method of accounting only if no controlling financial interest 50.00%mac_ThresholdOwnershipPercentageForEquityMethodAccountingOnlyIfNoControllingFinancialInterest
Buildings and improvements | Minimum  
Property, Plant and Equipment  
Estimated useful lives of assets (in years) 5 years
Buildings and improvements | Maximum  
Property, Plant and Equipment  
Estimated useful lives of assets (in years) 40 years
Tenant improvements | Minimum  
Property, Plant and Equipment  
Estimated useful lives of assets (in years) 5 years
Tenant improvements | Maximum  
Property, Plant and Equipment  
Estimated useful lives of assets (in years) 7 years
Equipment and furnishings | Minimum  
Property, Plant and Equipment  
Estimated useful lives of assets (in years) 5 years
Equipment and furnishings | Maximum  
Property, Plant and Equipment  
Estimated useful lives of assets (in years) 7 years