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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Stockholders Equity [Line Items]        
Basic EPS shares 90,774 90,629 90,733 90,622
Add: Operating Partnership - common and vested LTIP units 9,099 9,584 9,084 9,576
Diluted EPS Shares 99,873 100,213 99,817 100,198
Mack-Cali Realty LP [Member]        
Stockholders Equity [Line Items]        
Basic EPU units 99,873 100,213 99,817 100,198
Diluted EPU Units 99,873 100,213 99,817 100,198