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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital [Abstract]        
Shares, Outstanding, Beginning balance 66,321 74,413 67,289 108,318
Shares, Granted   40,185   40,185
Shares, Vested (40,185) (42,469) (41,153) (72,502)
Shares, Cancelled   (968)   (4,840)
Shares, Outstanding, Ending balance 26,136 71,161 26,136 71,161
Weighted-Average Grant-Date Fair Value, Outstanding beginning balance $ 22.38 $ 24.87 $ 22.43 $ 25.49
Weighted-Average Grant-Date Fair Value, Granted   20.16   20.16
Weighted-Average Grant-Date Fair Value, Vested 20.16 24.17 20.29 25.33
Weighted-Average Grant-Date Fair Value, Cancelled   25.83   25.83
Weighted-Average Grant-Date Fair Value, Outstanding ending balance $ 25.80 $ 22.63 $ 25.80 $ 22.63