Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Deferred Stock Compensation Plan For Directors) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Deferred Stock Compensation Plan For Directors) (Narrative) (Details) - shares
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital [Abstract]      
Maximum percentage of retainer fee that directors may defer 100.00%    
Deferred stock units earned 13,587 8,821  
Deferred stock units outstanding 223,884   210,738