Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Stock Option Plans) (Narrative) (Details)
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3 Months Ended |
12 Months Ended |
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Mar. 10, 2021
$ / shares
shares
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Jul. 26, 2020
$ / shares
shares
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Jun. 05, 2015
item
$ / shares
shares
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Mar. 31, 2021
USD ($)
shares
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Mar. 31, 2020
USD ($)
shares
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Dec. 31, 2020 |
Jul. 25, 2020
shares
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May 31, 2013
shares
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Weighted average remaining contractual life |
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6 years
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3 years 7 months 6 days
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| Share price | $ / shares |
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$ 17.31
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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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$ 114,000
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$ 0
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| Shares Under Options - Granted |
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800,000
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| Common stock trade share price | $ / shares |
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$ 25.00
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| Annual installments | item |
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3
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| Exercisable period |
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10 years
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| Common stock trading days |
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30 days
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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 | $ / shares |
$ 15.79
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| Shares Under Options - Granted |
950,000
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| Three Equal Annual Installment [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares Under Options - Granted |
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400,000
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| Common Stock Trades [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares Under Options - Granted |
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400,000
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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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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 |
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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 |
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230,000
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| Share price issued | $ / shares |
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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 | $ / shares |
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$ 20.00
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| Number of shares authorized |
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100,000
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| Share price issued | $ / shares |
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$ 20.00
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