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)

v3.21.2
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Long-Term Incentive Plan Awards) (Narrative) (Details)
$ / shares in Units, $ in Millions
 6 Months Ended
Apr. 21, 2021
item
shares
Nov. 03, 2020
Mar. 22, 2019
Mar. 13, 2019
Apr. 20, 2018
Jun. 30, 2021
USD ($)
shares
Dec. 31, 2023
$ / shares
Apr. 19, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of units forfeited               31.25%
Performance period           3 years    
2016 LTIP Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Dividends paid, percent representing common unit of limited partnership interest           10.00%    
Dividends paid, percent payable upon vesting of LTIP Unit           90.00%    
Unvested LTIP [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total unrecognized compensation cost | $           $ 7.2    
Total unrecognized compensation cost, period of recognition           1 year 10 months 24 days    
2018 OPP [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance period           3 years    
TSR percent           36.00%    
2019 OPP [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance period           3 years    
TSR percent           36.00%    
2020 OPP [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance period           3 years    
TSR percent           36.00%    
2021 RSU LTIP Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance period           3 years    
2021 RSU LTIP Awards [Member] | Time-Based Award [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares granted 291,951              
Annual installments | item 3              
Exercisable time period 3 years              
2021 RSU LTIP Awards [Member] | Performance Shares [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance period 3 years              
TSR percent 36.00%              
Shares granted 452,730              
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%      
Messr DeMarco, CEO [Member] | 2019 LTIP Awards [Member] | Time-Based Award [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percent of the award     25.00%          
Messr DeMarco, CEO [Member] | 2019 LTIP Awards [Member] | Performance Shares [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Remaining percent of the award     75.00%          
Messr DeMarco, CEO [Member] | 2019 TBV LTIP Units [Member] | Time-Based Award [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance period           3 years    
Messieur Tycher, Smetana, Wagner, Cardoso, And Hilton [Member] | 2019 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%          
Messr DeBari [Member] | 2019 LTIP Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percent of the award       100.00%        
Ricardo Cardoso [Member] | J Series 2021 OPP [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percent of estimated net asset   85.00%            
Maximum [Member] | Outperformance RSUs [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares granted           291,951    
Scenario, Forecast [Member] | Outperformance RSUs [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share price | $ / shares             $ 0.60