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
 3 Months Ended
Jun. 12, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
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   5,804 5,870  
Deferred stock units converted 193,949      
Deferred stock units outstanding   63,470   59,899