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, 2021
Mar. 31, 2020
Stockholders Equity [Line Items]    
Basic EPS shares 90,692 90,616
Add: Operating Partnership - common and vested LTIP units 9,068 9,567
Diluted EPS Shares 99,760 100,183
Mack-Cali Realty LP [Member]    
Stockholders Equity [Line Items]    
Basic EPU units 99,760 100,183
Diluted EPU Units 99,760 100,183