Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Long-Term Incentive Plan Awards) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Long-Term Incentive Plan Awards) (Narrative) (Details) - USD ($)
 9 Months Ended
Apr. 20, 2018
Apr. 04, 2017
Mar. 08, 2016
Jun. 05, 2015
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted       800,000  
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total unrecognized compensation cost         $ 0
2016 LTIP Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance period         3 years
Dividends paid, percent representing common unit of limited partnership interest         10.00%
Dividends paid, percent payable upon vesting of LTIP Unit         90.00%
Shares granted         22,215
Shares forfeited and cancelled         182,456
Unvested LTIP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total unrecognized compensation cost         $ 13,400,000
Total unrecognized compensation cost, period of recognition         2 years 7 months 6 days
2016 TBV LTIP Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted         108,764
2016 OPP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
TSR percent         50.00%
2016 OPP [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance period         3 years
2016 PBV LTIP Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted         339,119
2017 LTIP Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted         32,849
Shares forfeited and cancelled         87,521
2017 OPP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance period         3 years
TSR percent         36.00%
2017 PBV LTIP Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted         383,982
2017 TBV LTIP Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted         73,971
2018 LTIP Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares forfeited and cancelled         3,540
2018 OPP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance period         3 years
TSR percent         36.00%
2018 PBV LTIP Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted         651,928
2018 TBV LTIP Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted         208,556
Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2016 LTIP Awards [Member] | Time-Based Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of the award     25.00%    
Performance period         3 years
Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2016 LTIP Awards [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Remaining percent of the award     75.00%    
Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2017 LTIP Awards [Member] | Time-Based Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of the award   25.00%      
Performance period         3 years
Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2017 LTIP Awards [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Remaining percent of the award   75.00%      
Other Executive Officers [Member] | 2016 LTIP Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of the award     40.00%    
Remaining percent of the award     60.00%    
Other Executive Officers [Member] | 2017 LTIP Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of the award   40.00%      
Remaining percent of the award   60.00%      
Other Executive Officers [Member] | 2018 LTIP Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of the award 50.00%        
Remaining percent of the award 50.00%        
Messieur DeMarco And Messieur Tycher [Member] | 2018 LTIP Awards [Member] | Time-Based Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of the award 25.00%        
Performance period         3 years
Messieur DeMarco And Messieur Tycher [Member] | 2018 LTIP Awards [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Remaining percent of the award 75.00%