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)

v3.19.1
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
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested stock outstanding 66,321 74,413 67,289 108,318
Dividends declared per common share $ 0.20 $ 0.20    
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    
Unvested Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested stock outstanding 66,321 61,896    
Unvested Restricted Stock [Member] | Mack-Cali Realty LP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested stock outstanding 66,321 61,896    
Unvested LTIP Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested stock outstanding 1,826,331 1,145,772    
Unvested LTIP Units [Member] | Mack-Cali Realty LP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested performance shares 1,826,331 1,145,772    
Unvested AO LTIP Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested stock outstanding 625,000 0    
Unvested AO LTIP Units [Member] | Mack-Cali Realty LP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested stock outstanding 625,000 0