XML 49 R65.htm IDEA: XBRL DOCUMENT v2.4.1.9
Share and Unit-Based Plans - Compensation Cost (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share and unit-based plans    
Compensation cost under share and unit-based plans $ 18,815us-gaap_AllocatedShareBasedCompensationExpense $ 20,346us-gaap_AllocatedShareBasedCompensationExpense
LTIP Units    
Share and unit-based plans    
Compensation cost under share and unit-based plans 15,228us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= mac_LongTermIncentivePlanMember		 18,240us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= mac_LongTermIncentivePlanMember
Stock awards    
Share and unit-based plans    
Compensation cost under share and unit-based plans 75us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= mac_StockAwardsMember		 114us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= mac_StockAwardsMember
Stock units    
Share and unit-based plans    
Compensation cost under share and unit-based plans 3,197us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= mac_StockUnitsMember		 1,682us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= mac_StockUnitsMember
Stock options    
Share and unit-based plans    
Compensation cost under share and unit-based plans 4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Phantom stock units    
Share and unit-based plans    
Compensation cost under share and unit-based plans $ 311us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember		 $ 306us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember