Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Restricted Stock Awards And Performance Share Units) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Restricted Stock Awards And Performance Share Units) (Narrative) (Details) - USD ($)
9 Months Ended
Jun. 05, 2018
Jun. 05, 2015
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested stock outstanding     67,289 108,318  
Shares granted     40,185    
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested stock outstanding     67,289    
Restricted Stock [Member] | 2013 Incentive Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted   37,550.54      
Performance period     3 years    
Restricted Stock [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock compensation vesting period     1 year    
Restricted Stock [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock compensation vesting period     7 years    
Unvested Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested stock outstanding     67,289   95,801
Total Stockholder Return Based Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total unrecognized compensation cost     $ 800,000    
Total unrecognized compensation cost, period of recognition     9 months 18 days    
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested performance shares     0    
Total unrecognized compensation cost     $ 0    
Performance Shares [Member] | 2013 Incentive Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted   112,651.64      
Performance period     3 years    
Performance Shares [Member] | 2013 Incentive Stock Plan [Member] | Three Years Period Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of shares vested 100.00%        
Performance Shares [Member] | Minimum [Member] | 2013 Incentive Stock Plan [Member] | Three Years Period Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of shares vested     0.00%    
Performance Shares [Member] | Maximum [Member] | 2013 Incentive Stock Plan [Member] | Three Years Period Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of shares vested     150.00%