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 Reconciliation Of Shares Used In Basic EPS Calculation To Shares Used In Diluted EPS Calculation) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Reconciliation Of Shares Used In Basic EPS Calculation To Shares Used In Diluted EPS Calculation) (Details) - shares
shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Stockolders Equity [Line Items]        
Basic EPS shares 90,671 90,584 90,639 90,539
Add: Operating Partnership - common and vested LTIP units 9,636 9,976 9,596 10,068
Restricted Stock Awards       24
Stock Options       171
Diluted EPS Shares 100,307 100,560 100,235 100,802
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Basic EPU units 100,307 100,560 100,235 100,607
Restricted Stock Awards       24
Stock Options       171
Diluted EPU Units 100,307 100,560 100,235 100,802