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Mack-Cali Realty Corporation Stockholders' Equity (Deferred Stock Compensation Plan For Directors) (Narrative) (Details)
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Mack-Cali Realty Corporation Stockholders' Equity      
Deferred stock units earned 6,385 6,311  
Deferred stock units outstanding 90,585   84,236