Mack-Cali Realty Corporation Stockholders' Equity (Deferred Stock Compensation Plan For Directors) (Narrative) (Details)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]      
Maximum percentage of retainer fee that directors may defer 100.00%    
Deferred stock units earned 5,002 5,707  
Deferred stock units outstanding 162,761   157,730