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Derivatives and Hedging Activities (Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]      
Beginning balance $ (38,579) $ (52,267)  
Unrealized losses from the effective portion of derivative instruments (8,409) (13,951) (35,538)
Amounts reclassified from accumulated other comprehensive income (interest rate contracts) (20,107) (27,639) (34,021)
Net current-period other comprehensive income attributable to MAA 11,698 13,688 (1,517)
Ending balance $ (26,881) $ (38,579) $ (52,267)