Annual report pursuant to Section 13 and 15(d)

Noncontrolling Interests In Subsidiaries (Changes In Noncontrolling Interests Of Subsidiaries) (Details)

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Noncontrolling Interests In Subsidiaries (Changes In Noncontrolling Interests Of Subsidiaries) (Details) - Mack-Cali Realty LP [Member] - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance, Beginning, Common Units/Vested LTIP Units 9,612,064 10,229,349 10,438,855
Redemption of common units for shares of common stock   (38,011) (264,570)
Redemption of common units (138,615) (665,918)  
Conversion of vested LTIP units to common units 38,626 18,438  
Vested LTIP units 136,957 68,206 55,064
Cancellation of units (1)    
Balance, Ending, Common Units/Vested LTIP Units 9,649,031 9,612,064 10,229,349
Balance, Beginning, Unvested LTIP Units 1,826,331 1,707,106 1,230,877
Vested LTIP units (175,583) (86,644) (55,064)
Issuance of units, LTIP Units 1,287,568 565,623 864,024
Cancellation of units (1,215,387) (359,754) (332,731)
Balance, Ending, Unvested LTIP Units 1,722,929 1,826,331 1,707,106