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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Stockolders Equity [Line Items]        
Basic EPS shares 90,629 90,533 90,622 90,516
Add: Operating Partnership - common and vested LTIP units 9,584 9,990 9,576 10,115
Restricted Stock Awards       26
Stock Options       168
Diluted EPS Shares 100,213 100,523 100,198 100,825
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Basic EPU units 100,213 100,523 100,198 100,631
Restricted Stock Awards       26
Stock Options       168
Diluted EPU Units 100,213 100,523 100,198 100,825