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)

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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested restricted stock outstanding 71,161   71,161   108,318
Dividends declared per common share $ 0.20 $ 0.20 $ 0.40 $ 0.35  
Unvested performance shares     1,795,747 1,230,877  
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 $ 0.40 $ 0.35  
Unvested performance shares     1,795,747 1,230,877  
Unvested Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested restricted stock outstanding 71,161 96,769 71,161 96,769  
Unvested Restricted Stock [Member] | Mack-Cali Realty LP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested restricted stock outstanding 71,161 96,769 71,161 96,769