Redeemable Noncontrolling Interests (Narrative) (Details) - USD ($)
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6 Months Ended |
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Mar. 10, 2017 |
Feb. 28, 2017 |
Feb. 27, 2017 |
Feb. 03, 2017 |
Jun. 30, 2017 |
Apr. 30, 2017 |
| Redeemable Noncontrolling Interest [Line Items] |
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| Expiration period |
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10 years
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| Minimum [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Percentage of interest in venture |
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12.50%
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| Maximum [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Percentage of interest in venture |
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85.00%
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| Rockpoint [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Pro rata distribution |
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10.90%
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| RRT [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Pro rata distribution |
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89.10%
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| Series A Units [Member] | Mack-Cali Realty LP [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Preferred units aggregate amount |
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$ 42,800,000
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| Preferred units shares issued |
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42,800
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| Preferred unit annual rate |
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3.50%
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| Percentage of interest in venture |
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37.50%
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| Preferred unit in operating partnership |
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$ 1,000
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| Convertible preferred units |
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28.15
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| Expiration period |
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5 years
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| Shares converted to common units |
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1,204,820
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| Common unit distribution per unit declared |
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$ 35.52
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| Series A-1 Units [Member] | Mack-Cali Realty LP [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Preferred units shares issued |
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9,213
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91
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| Preferred unit annual rate |
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3.50%
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| Percentage of interest in venture |
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13.80%
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| Preferred unit in operating partnership |
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$ 1,000
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| Convertible preferred units |
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27.936
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| Expiration period |
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5 years
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| Shares converted to common units |
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257,375
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| Common unit distribution per unit declared |
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$ 35.80
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| Monaco Towers [Member] | Series A-1 Units [Member] | Mack-Cali Realty LP [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Preferred units aggregate amount |
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$ 9,100,000
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| Preferred units shares issued |
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9,122
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| Investment Agreement [Member] | Rockpoint [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Contributed equity value |
$ 1,230,000,000
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| Incremental closing payments, Limited Partnership interest |
$ 150,000,000
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| Investment Agreement [Member] | Rockpoint [Member] | Minimum [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Incremental closing payments, Limited Partnership interest |
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$ 10,000,000
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| Investment Agreement [Member] | Rockpoint [Member] | Maximum [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Contributed amount to obtain equity units |
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$ 300,000,000
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| RRLP [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Annual return on the equity value |
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6.00%
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| RRLP [Member] | Rockpoint [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Annual return |
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6.00%
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| Base return |
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5.00%
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| Internal rate of return |
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11.00%
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| Pro rata share |
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50.00%
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| RRLP [Member] | RRT [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Base return |
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95.00%
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| Participation Rights [Member] | Maximum [Member] |
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| Redeemable Noncontrolling Interest [Line Items] |
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| Contributed amount to obtain equity units |
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$ 200,000,000
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