Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share/Unit) (Narrative) (Details)

v3.10.0.1
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share/Unit) (Narrative) (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested stock outstanding 67,289   67,289   108,318
Dividends declared per common share $ 0.20 $ 0.20 $ 0.60 $ 0.55  
Mack-Cali Realty LP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Dividends declared per common share $ 0.20 $ 0.20 $ 0.60 $ 0.55  
Unvested performance shares     1,766,320 1,230,877  
Unvested Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested stock outstanding 67,289 95,801 67,289 95,801  
Unvested Restricted Stock [Member] | Mack-Cali Realty LP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested stock outstanding 67,289 95,801 67,289 95,801  
Unvested LTIP Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested stock outstanding 1,766,320 1,230,877 1,766,320 1,230,877