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
Mar. 31, 2020
Mar. 31, 2019
Stockolders Equity [Line Items]    
Basic EPS shares 90,616 90,498
Add: Operating Partnership - common and vested LTIP units 9,567 10,242
Restricted Stock Awards   66
Stock Options   137
Diluted EPS Shares 100,183 100,943
Mack-Cali Realty LP [Member]    
Stockolders Equity [Line Items]    
Basic EPU units 100,183 100,740
Restricted Stock Awards   66
Stock Options   137
Diluted EPU Units 100,183 100,943