Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (AO LTIP Units (Appreciation-Only LTIP Units)) (Narrative) (Details) - USD ($)
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3 Months Ended |
9 Months Ended |
15 Months Ended |
Sep. 30, 2021 |
Sep. 30, 2020 |
Mar. 31, 2019 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock options expense |
$ 253,000
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$ 192,000
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|
$ 591,000
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$ 192,000
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| AO LTIP Units Award [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share price |
$ 21.46
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$ 21.46
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$ 21.46
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| Exercisable period |
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10 years
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| Total unrecognized compensation cost |
$ 900,000
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$ 900,000
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$ 900,000
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| Total unrecognized compensation cost, period of recognition |
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1 year 4 months 24 days
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| Stock options expense |
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$ 466,000
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$ 466,000
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$ 156,000
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| AO LTIP Units Award [Member] | Messr DeMarco, CEO [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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625,000
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| Income allocation |
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10.00%
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| Percent of cash distribution |
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10.00%
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| AO LTIP Units Award [Member] | Messr DeMarco, CEO [Member] | Tranche One [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares to be vested and exercisable |
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250,000
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| Common stock trading days |
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30 days
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| Common stock trade share price |
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$ 25.00
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| Common stock expiration date |
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Mar. 13, 2023
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| AO LTIP Units Award [Member] | Messr DeMarco, CEO [Member] | Tranche Two [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares to be vested and exercisable |
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250,000
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| Common stock trading days |
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30 days
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| Common stock trade share price |
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$ 28.00
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| AO LTIP Units Award [Member] | Messr DeMarco, CEO [Member] | Tranche Three [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares to be vested and exercisable |
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125,000
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| Common stock trading days |
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30 days
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| Common stock trade share price |
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$ 31.00
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