Mack-Cali Realty Corporation Stockholders' Equity (Stock Options Plans) (Narrative) (Details)
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3 Months Ended |
6 Months Ended |
12 Months Ended |
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Jun. 05, 2015
item
$ / shares
shares
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Jun. 30, 2015
USD ($)
$ / shares
shares
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Jun. 30, 2014
USD ($)
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Jun. 30, 2015
USD ($)
$ / shares
shares
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Jun. 30, 2014
USD ($)
shares
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Dec. 31, 2014 |
May. 31, 2013
shares
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May. 31, 2004
shares
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock option terms |
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10 years
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| Weighted average remaining contractual life |
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9 years 9 months 18 days
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4 years 10 months 24 days
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| Share price | $ / shares |
$ 17.31
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$ 3.06
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$ 3.06
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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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$ 62,000
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$ 1,000
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$ 63,000
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$ 2,000
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| Shares under options - Granted |
800,000
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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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| 2004 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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2,500,000
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| Shares issued |
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0
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0
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| Employee And Director Plan [Member] | Minimum [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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2,700,000
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2,700,000
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| Employee And Director Plan [Member] | Maximum [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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4,350,000
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4,350,000
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| 2000 Employee Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercisable time period |
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5 years
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| 2000 Employee Plan [Member] | Minimum [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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2,500,000
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2,500,000
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| 2000 Employee Plan [Member] | Maximum [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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4,000,000
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4,000,000
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| 2000 Director Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Exercisable time period |
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1 year
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| 2000 Director Plan [Member] | Minimum [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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200,000
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200,000
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| 2000 Director Plan [Member] | Maximum [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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350,000
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350,000
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