Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Restricted Stock Awards) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Restricted Stock Awards) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital [Abstract]        
Shares, Outstanding, Beginning balance 42,690 66,321 42,690 67,289
Shares, Vested     (25,614) (41,153)
Shares, Cancelled (25,614) (40,185)    
Shares, Outstanding, Ending balance 17,076 26,136 17,076 26,136
Weighted-Average Grant-Date Fair Value, Outstanding beginning balance $ 21.08 $ 22.38 $ 21.08 $ 22.43
Weighted-Average Grant-Date Fair Value, Vested 21.08 20.16 21.08 20.29
Weighted-Average Grant-Date Fair Value, Outstanding ending balance $ 21.08 $ 25.80 $ 21.08 $ 25.80