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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Basic EPS shares 89,755 89,249 89,739 89,229
Add: Operating Partnership - common units 10,498 10,923 10,502 11,007
Restricted Stock Awards     50  
Stock Options     195  
Diluted EPS Shares 100,253 100,172 100,486 100,236
Mack Cali Realty LP [Member]        
Basic weighted average units outstanding 100,253 100,172 100,241 100,236
Restricted Stock Awards     50  
Stock Options     195  
Diluted weighted average units outstanding 100,253 100,172 100,486 100,236