Recent Transactions (Unconsolidated Joint Venture Activity) (Narrative) (Details)
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1 Months Ended |
3 Months Ended |
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Feb. 28, 2017
USD ($)
ft²
item
shares
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Feb. 15, 2017
USD ($)
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Jan. 31, 2017
USD ($)
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Apr. 30, 2017
USD ($)
shares
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Mar. 31, 2017
USD ($)
item
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Mar. 31, 2016
USD ($)
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May 01, 2017 |
Dec. 31, 2016 |
| Real Estate Properties [Line Items] |
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| Gain on sale of investment in unconsolidated joint venture |
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$ 12,563,000
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| Proceeds from the sale of investments in unconsolidated joint ventures |
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$ 14,849,000
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| Expiration period |
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10 years
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| Investment in unconsolidated joint ventures |
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$ 6,625,000
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$ 7,225,000
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| Percentage of ownership interest |
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89.70%
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89.50%
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| Series A-1 Units [Member] |
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| Real Estate Properties [Line Items] |
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| Percentage of ownership interest |
29.00%
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| Multi-Family Properties [Member] |
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| Real Estate Properties [Line Items] |
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| Number of units | item |
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5,032
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| Unconsolidated Joint Venture Multi-Family Properties [Member] |
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| Real Estate Properties [Line Items] |
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| Number of units | item |
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3,005
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| Mack-Cali Realty LP [Member] |
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| Real Estate Properties [Line Items] |
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| Gain on sale of investment in unconsolidated joint venture |
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$ 12,563,000
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| Proceeds from the sale of investments in unconsolidated joint ventures |
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14,849,000
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| Investment in unconsolidated joint ventures |
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$ 6,625,000
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$ 7,225,000
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| Mack-Cali Realty LP [Member] | Series A-1 Units [Member] |
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| Real Estate Properties [Line Items] |
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| Preferred units shares issued | shares |
9,213
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| Preferred unit annual rate |
3.50%
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| Percentage of interest in venture |
13.80%
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| Preferred unit in operating partnership |
$ 1,000
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| Expiration period |
5 years
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| KPG-P 100 IMW JV, LLC, Keystone-Penn And Keystone-Tristate [Member] |
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| Real Estate Properties [Line Items] |
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| Gain on sale of investment in unconsolidated joint venture |
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$ 7,400,000
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| Proceeds from the sale of investments in unconsolidated joint ventures |
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$ 9,700,000
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| Elmajo Urban Renewal Associates, LLC And Estuary Urban Renewal Associates, LLC [Member] |
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| Real Estate Properties [Line Items] |
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| Percentage of interest in venture |
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7.50%
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| Proceeds from the sale of investments in unconsolidated joint ventures |
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$ 5,100,000
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| Elmajo Urban Renewal Associates, LLC And Estuary Urban Renewal Associates, LLC [Member] | Unconsolidated Joint Venture Multi-Family Properties [Member] |
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| Real Estate Properties [Line Items] |
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| Gain on sale of investment in unconsolidated joint venture |
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$ 5,100,000
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| Percentage of interest in venture |
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7.50%
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| Proceeds from the sale of investments in unconsolidated joint ventures |
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$ 5,100,000
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| Monaco Towers [Member] |
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| Real Estate Properties [Line Items] |
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| Number of units | item |
523
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| Number of parking spaces | item |
558
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| Number of towers | item |
2
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| Number of stories | item |
50
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| Area of property (in square feet) | ft² |
12,300
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| Monaco Towers [Member] | Series A-1 Units [Member] |
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| Real Estate Properties [Line Items] |
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| Percentage of interest in venture |
13.80%
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| Monaco Towers [Member] | Mack-Cali Realty LP [Member] | Series A-1 Units [Member] |
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| Real Estate Properties [Line Items] |
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| Preferred units shares issued | shares |
9,122
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| Preferred units aggregate amount |
$ 9,100,000
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| Subsequent Event [Member] | Mack-Cali Realty LP [Member] | Series A-1 Units [Member] |
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| Real Estate Properties [Line Items] |
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| Preferred units shares issued | shares |
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91
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| Subsequent Event [Member] | Monaco Towers [Member] | Mack-Cali Realty LP [Member] | Series A-1 Units [Member] |
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| Real Estate Properties [Line Items] |
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| Percentage of interest in venture |
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71.20%
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100.00%
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| Investment in unconsolidated joint ventures |
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$ 130,000,000
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| Debt assumed |
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$ 165,000,000
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