Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Stock Options Plans) (Narrative) (Details)
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12 Months Ended |
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Jun. 05, 2015
item
$ / shares
shares
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Dec. 31, 2017
USD ($)
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Dec. 31, 2016
USD ($)
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Dec. 31, 2015
USD ($)
$ / shares
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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7 years 4 months 24 days
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8 years 4 months 24 days
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| Share price | $ / shares |
$ 17.31
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| Share price - weighted average fair value of options granted | $ / shares |
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$ 3.06
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| Proceeds from stock options exercised | $ |
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$ 0
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$ 0
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$ 0
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| Stock options expense | $ |
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$ 464,000
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$ 1,407,000
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$ 432,000
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| Shares Under Options - Granted |
800,000
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| Common stock trade share price | $ / shares |
$ 25.00
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| Annual installments | item |
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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| 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 |
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 |
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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| Shares Under Options - Granted |
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800,000
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