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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stockolders Equity [Line Items]        
Basic EPS shares 90,023 89,755 89,997 89,739
Add: Operating Partnership - common units 10,439 10,498 10,394 10,502
Restricted Stock Awards 32   37 50
Stock Options 233   273 195
Diluted EPS Shares 100,727 100,253 100,701 100,486
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Basic weighted average units outstanding 100,462 100,253 100,391 100,241
Restricted Stock Awards 32   37 50
Stock Options 233   273 195
Diluted weighted average units outstanding 100,727 100,253 100,701 100,486