Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Weighted Average Assumptions) (Details) - AO LTIP Units Award [Member] |
3 Months Ended |
|---|---|
Mar. 31, 2019 | |
| 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] | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Expected life (in years) | 5 years 6 months |
| Maximum [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Expected life (in years) | 6 years |