Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Deferred Stock Compensation Plan For Directors) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Deferred Stock Compensation Plan For Directors) (Narrative) (Details) - shares
9 Months Ended
Sep. 30, 2015
Sep. 30, 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 15,279 15,230  
Deferred stock units outstanding 173,025   157,730