Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Stock Option Plans) (Narrative) (Details) - USD ($)
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3 Months Ended |
9 Months Ended |
12 Months Ended |
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Jun. 09, 2021 |
Mar. 10, 2021 |
Jul. 26, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2020 |
Jun. 30, 2021 |
Jul. 25, 2020 |
May 31, 2013 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Weighted average remaining contractual life |
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5 years 8 months 12 days
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3 years 7 months 6 days
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| Options exercised |
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0
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0
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| Stock options expense |
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$ 253,000
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$ 192,000
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$ 591,000
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$ 192,000
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| Mahbod Nia, CEO [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share price |
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$ 15.79
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| Shares Under Options - Granted |
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950,000
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| 2013 Incentive Stock Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Reserved stocks for issuance |
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6,565,000
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4,600,000
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| MAG Partners [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares Under Options - Granted |
157,505
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157,505
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| MAG Partners [Member] | Maximum [Member] | Common Class At $14.39 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares authorized |
230,000
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230,000
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| Share price issued |
$ 14.39
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$ 14.39
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| MAG Partners [Member] | Maximum [Member] | Common Class At $20.00 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Share price |
$ 20.00
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| Number of shares authorized |
100,000
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100,000
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| Share price issued |
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$ 20.00
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