Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Restricted Stock Awards And Performance Share Units) (Narrative) (Details) - USD ($)
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12 Months Ended |
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Jun. 05, 2015 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unvested stock outstanding |
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67,289
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108,318
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145,278
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136,220
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| Shares granted |
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40,185
|
59,985
|
74,622
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| Restricted Stock [Member] | 2013 Incentive Stock Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock compensation vesting period |
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3 years
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| Shares granted |
37,550.54
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| Restricted Stock [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock compensation vesting period |
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1 year
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| Restricted Stock [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock compensation vesting period |
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7 years
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| Unvested Restricted Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
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| Unvested stock outstanding |
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67,289
|
95,801
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120,245
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| Total Stockholder Return Based Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Total unrecognized compensation cost |
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$ 500,000
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| Total unrecognized compensation cost, period of recognition |
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6 months
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| Performance Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unvested stock outstanding |
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0
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| Total unrecognized compensation cost |
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$ 0
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| Performance Shares [Member] | 2013 Incentive Stock Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
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| Shares granted |
112,651.64
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| Performance period |
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3 years
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| Performance Shares [Member] | Minimum [Member] | 2013 Incentive Stock Plan [Member] | Three Years Period Award [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percentage of shares vested |
0.00%
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| Performance Shares [Member] | Maximum [Member] | 2013 Incentive Stock Plan [Member] | Three Years Period Award [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percentage of shares vested |
150.00%
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