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 ($)
$ in Millions
 9 Months Ended
Apr. 04, 2017
Mar. 08, 2016
Jun. 05, 2015
Sep. 30, 2017
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       $ 0.3
Total unrecognized compensation cost, period of recognition       8 months 12 days
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%
Total unrecognized compensation cost       $ 12.4
Total unrecognized compensation cost, period of recognition       2 years 8 months 12 days
2016 TBV LTIP Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted       155,773
2016 OPP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
TSR percent       50.00%
2016 PBV LTIP Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted       496,781
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       481,436
2017 TBV LTIP Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted       96,887
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%