Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share/Unit) (Narrative) (Details) - $ / shares
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3 Months Ended |
6 Months Ended |
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Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unvested stock outstanding |
26,136
|
71,161
|
26,136
|
71,161
|
66,321
|
67,289
|
74,413
|
108,318
|
| Dividends declared per common share |
$ 0.20
|
$ 0.20
|
$ 0.40
|
$ 0.40
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| Mack-Cali Realty LP [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Dividends declared per common share |
$ 0.20
|
$ 0.20
|
$ 0.40
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$ 0.40
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| Unvested Restricted Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
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|
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| Unvested stock outstanding |
26,136
|
71,161
|
26,136
|
71,161
|
|
|
|
|
| Unvested Restricted Stock [Member] | Mack-Cali Realty LP [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
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|
|
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| Unvested stock outstanding |
26,136
|
71,161
|
26,136
|
71,161
|
|
|
|
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| Unvested LTIP Units [Member] |
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|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unvested stock outstanding |
1,826,331
|
1,795,747
|
1,826,331
|
1,795,747
|
|
|
|
|
| Unvested LTIP Units [Member] | Mack-Cali Realty LP [Member] |
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|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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| Unvested performance shares |
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|
1,826,331
|
1,795,747
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|
|
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| Unvested AO LTIP Units [Member] |
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|
|
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|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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| Unvested stock outstanding |
625,000
|
0
|
625,000
|
0
|
|
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| Unvested AO LTIP Units [Member] | Mack-Cali Realty LP [Member] |
|
|
|
|
|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unvested stock outstanding |
625,000
|
0
|
625,000
|
0
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