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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Stockholders Equity [Line Items]        
Basic EPS shares 90,941 90,671 90,803 90,639
Add: Operating Partnership - common and vested LTIP units 9,034 9,636 9,067 9,596
Diluted EPS Shares 99,975 100,307 99,870 100,235
Mack-Cali Realty LP [Member]        
Stockholders Equity [Line Items]        
Basic EPU units 99,975 100,307 99,870 100,235
Diluted EPU Units 99,975 100,307 99,870 100,235