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, 2018
Mar. 31, 2017
Stockolders Equity [Line Items]    
Basic EPS shares 90,263 89,955
Add: Operating Partnership - common and vested LTIP units 10,242 10,384
Restricted Stock Awards 35 1
Stock Options 64 297
Diluted EPS Shares 100,604 100,637
Mack-Cali Realty LP [Member]    
Stockolders Equity [Line Items]    
Basic weighted average units outstanding 100,505 100,339
Restricted Stock Awards 35 1
Stock Options 64 297
Diluted EPU Units 100,604 100,637