Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stockholders Equity [Line Items]      
Basic EPS shares 90,648 90,557 90,388
Add: Operating Partnership - common and vested LTIP units 9,612 9,963 10,246
Stock Options   169 90
Diluted EPS Shares 100,260 100,689 100,724
Mack-Cali Realty LP [Member]      
Stockholders Equity [Line Items]      
Basic EPU units 100,260 100,520 100,634
Stock Options   169 90
Diluted EPU Units 100,260 100,689 100,724