Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Restricted Stock Awards) (Narrative) (Details) - USD ($)
$ in Millions |
|
12 Months Ended |
|
Jun. 05, 2015 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Unvested stock outstanding |
|
52,974
|
42,690
|
67,289
|
108,318
|
| Shares granted |
|
52,974
|
42,690
|
40,185
|
|
| Performance period |
|
3 years
|
|
|
|
| Restricted Stock [Member] | 2013 Incentive Stock Plan [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
|
|
|
|
| Shares granted |
37,550.54
|
|
|
|
|
| Restricted Stock [Member] | Minimum [Member] |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |
|
1 year
|
|
|
|
| Restricted Stock [Member] | Maximum [Member] |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |
|
7 years
|
|
|
|
| Unvested Restricted Stock [Member] |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Unvested stock outstanding |
|
52,974
|
42,690
|
67,289
|
|
| Total Stockholder Return Based Awards [Member] |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Total unrecognized compensation cost |
|
$ 0.4
|
|
|
|
| Total unrecognized compensation cost, period of recognition |
|
6 months
|
|
|
|