Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital [Abstract]      
Shares, Outstanding, Beginning balance 108,318 145,278 136,220
Shares, Granted 40,185 59,985 74,622
Shares, Vested (72,502) (95,009) (61,654)
Shares, Cancelled (8,712) (1,936) (3,910)
Shares, Outstanding, Ending balance 67,289 108,318 145,278
Weighted-Average Grant-Date Fair Value, Outstanding beginning balance $ 25.49 $ 21.76 $ 19.36
Weighted-Average Grant-Date Fair Value, Granted 20.16 27.00 23.79
Weighted-Average Grant-Date Fair Value, Vested 25.33 20.73 18.94
Weighted-Average Grant-Date Fair Value, Cancelled 25.83 25.83 21.58
Weighted-Average Grant-Date Fair Value, Outstanding ending balance $ 22.43 $ 25.49 $ 21.76