Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Weighted Average Assumptions) (Details) |
9 Months Ended | |
|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected life (in years) | 5 years 3 months 18 days | |
| Risk-free interest rate | 0.41% | |
| Volatility | 31.00% | |
| Dividend yield | 2.70% | |
| AO LTIP Units Award [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Risk-free interest rate | 2.60% | |
| Volatility | 29.00% | |
| Dividend yield | 3.50% | |
| Minimum [Member] | AO LTIP Units Award [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected life (in years) | 5 years 6 months | |
| Maximum [Member] | AO LTIP Units Award [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected life (in years) | 6 years | |