Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporations Stockholders' Equity (Long-Term Incentive Plan Awards) (Narrative) (Details)

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Mack-Cali Realty Corporations Stockholders' Equity (Long-Term Incentive Plan Awards) (Narrative) (Details)
$ in Millions
 3 Months Ended
Mar. 08, 2016
Jun. 05, 2015
shares
Mar. 31, 2016
USD ($)
item
shares
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 | $     $ 1.1
Total unrecognized compensation cost, period of recognition     2 years 2 months 12 days
2016 LTIP Plan 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 | $     $ 8.7
Total unrecognized compensation cost, period of recognition     3 years 4 months 24 days
2016 TBV LTIP Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted     157,617
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     499,756
Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2016 LTIP Plan 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 Plan 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 Plan 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%    
Executive Officers [Member] | 2016 LTIP Plan Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of senior management who received 2016 LTIP awards | item     8