Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Long-Term Incentive Plan Awards) (Narrative) (Details) - USD ($)
$ in Millions |
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12 Months Ended |
Mar. 22, 2019 |
Apr. 20, 2018 |
Apr. 04, 2017 |
Mar. 08, 2016 |
Jun. 05, 2015 |
Dec. 31, 2020 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Performance period |
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3 years
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| Shares granted |
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800,000
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| 2016 LTIP Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Dividends paid, percent representing common unit of limited partnership interest |
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10.00%
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| Dividends paid, percent payable upon vesting of LTIP Unit |
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90.00%
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| Total unrecognized compensation cost |
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$ 8.0
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| Total unrecognized compensation cost, period of recognition |
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2 years 3 months 18 days
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| 2016 TBV LTIP Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares granted |
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68,205
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| 2016 OPP [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Performance period |
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3 years
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| TSR percent |
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50.00%
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| 2016 OPP [Member] | Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Performance period |
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3 years
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| 2016 PBV LTIP Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares granted |
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3,718
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| 2017 LTIP Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares forfeited and cancelled |
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369,924
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| 2017 OPP [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Performance period |
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3 years
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| TSR percent |
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36.00%
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| 2017 PBV LTIP Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares granted |
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10,264
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| 2017 TBV LTIP Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares granted |
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70,772
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| 2018 LTIP Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares forfeited and cancelled |
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102,639
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| 2018 OPP [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Performance period |
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3 years
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| TSR percent |
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36.00%
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| 2018 PBV LTIP Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares granted |
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542,651
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| 2018 TBV LTIP Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares granted |
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177,179
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| 2019 LTIP Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares forfeited and cancelled |
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175,570
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| 2019 TBV LTIP Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares granted |
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140,995
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| 2019 PBV LTIP Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares granted |
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249,058
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| 2019 OPP [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Performance period |
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3 years
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| TSR percent |
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36.00%
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| 2020 OPP [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Performance period |
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3 years
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| TSR percent |
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36.00%
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| 2020 PBV LTIP Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares granted |
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720,314
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| 2020 LTIP Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Performance period |
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3 years
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| Shares forfeited and cancelled |
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567,254
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| Other Executive Officers [Member] | 2016 LTIP Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percent of the award |
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40.00%
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| Remaining percent of the award |
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60.00%
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| Other Executive Officers [Member] | 2017 LTIP Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percent of the award |
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40.00%
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| Remaining percent of the award |
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60.00%
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| Other Executive Officers [Member] | 2018 LTIP Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percent of the award |
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50.00%
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| Remaining percent of the award |
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50.00%
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| Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2016 LTIP Awards [Member] | Time-Based Award [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percent of the award |
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25.00%
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| Performance period |
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3 years
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| Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2016 LTIP Awards [Member] | Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Remaining percent of the award |
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75.00%
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| Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2017 LTIP Awards [Member] | Time-Based Award [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percent of the award |
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25.00%
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| Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2017 LTIP Awards [Member] | Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Remaining percent of the award |
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75.00%
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| Messieur Rudin, Messieur DeMarco, And Messieur Tycher [Member] | 2017 TBV LTIP Units [Member] | Time-Based Award [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Performance period |
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3 years
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| Messieur DeMarco And Messieur Tycher [Member] | 2018 LTIP Awards [Member] | Time-Based Award [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percent of the award |
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25.00%
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| Performance period |
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3 years
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| Messieur DeMarco And Messieur Tycher [Member] | 2018 LTIP Awards [Member] | Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Remaining percent of the award |
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75.00%
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| Messr DeMarco, CEO [Member] | 2019 LTIP Awards [Member] | Time-Based Award [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percent of the award |
25.00%
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| Messr DeMarco, CEO [Member] | 2019 LTIP Awards [Member] | Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Remaining percent of the award |
75.00%
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| Messieur Tycher, Smetana, Wagner, Cardoso, And Hilton [Member] | 2019 TBV LTIP Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percent of the award |
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50.00%
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| Messieur Tycher, Smetana, Wagner, Cardoso, And Hilton [Member] | 2019 PBV LTIP Units [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Remaining percent of the award |
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50.00%
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| Messr DeBari [Member] | 2019 LTIP Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percent of the award |
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100.00%
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