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) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Restricted Stock Awards) (Narrative) (Details)
9 Months Ended
Sep. 30, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance period 3 years
Unvested Restricted Stock [Member] | Board Member [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested stock outstanding 39,529
Unvested Restricted Stock [Member] | Non-Executive Employees [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years
Unvested stock outstanding 208,769