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 ($)
3 Months Ended 6 Months Ended
Jun. 05, 2018
Jun. 05, 2015
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Unvested stock outstanding     71,161 26,136 71,161 66,321 67,289 74,413 108,318
Shares granted     40,185   40,185        
Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Unvested stock outstanding       26,136          
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     71,161 26,136 71,161        
Total Stockholder Return Based Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Total unrecognized compensation cost       $ 56,000          
Total unrecognized compensation cost, period of recognition       3 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%