Recent Transactions (Consolidations) (Narrative) (Details)
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|
3 Months Ended |
9 Months Ended |
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Aug. 02, 2018
USD ($)
item
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Sep. 30, 2018
USD ($)
item
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Sep. 30, 2017
USD ($)
|
Sep. 30, 2018
USD ($)
item
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Sep. 30, 2017
USD ($)
|
Aug. 01, 2018
USD ($)
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Dec. 31, 2017
USD ($)
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| Real Estate Properties [Line Items] |
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| Acquisition cost |
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|
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$ 6,658,000
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$ 19,279,000
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| Consolidated joint ventures, total real estate assets |
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$ 471,300,000
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$ 471,300,000
|
|
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$ 215,500,000
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| Percentage of ownership interest |
|
89.80%
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89.80%
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89.60%
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| Number of units | item |
|
1,153
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1,153
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|
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| Purchase price of property |
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|
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$ 132,252,000
|
67,797,000
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| Gain on sale of investment in unconsolidated joint venture |
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$ 10,568,000
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23,131,000
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| Gain on change of control of interests |
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$ 14,217,000
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|
14,217,000
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| Issuance of loan |
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30,400,000
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| Loan balance |
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2,807,718,000
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2,807,718,000
|
|
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$ 2,809,568,000
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| Noncontrolling interest's fair value |
|
209,622,000
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209,622,000
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$ 192,428,000
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| Mack-Cali Realty LP [Member] |
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| Real Estate Properties [Line Items] |
|
|
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|
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| Acquisition cost |
|
|
|
6,658,000
|
19,279,000
|
|
|
| Purchase price of property |
|
|
|
132,252,000
|
67,797,000
|
|
|
| Gain on sale of investment in unconsolidated joint venture |
|
|
$ 10,568,000
|
|
$ 23,131,000
|
|
|
| Gain on change of control of interests |
|
14,217,000
|
|
$ 14,217,000
|
|
|
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| Marbella Tower Urban Renewal Associates LLC [Member] |
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| Real Estate Properties [Line Items] |
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| Percentage of interest in venture |
24.27%
|
|
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|
24.27%
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| Percentage of additional interest acquired |
50.00%
|
|
|
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| Number of units | item |
412
|
|
|
|
|
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| Purchase price of property |
$ 65,600,000
|
|
|
|
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| Mortgage loan, maturity date |
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Aug. 01, 2026
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| Spread over LIBOR |
4.07%
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| Mortgage loan carrying amount |
$ 131,000,000
|
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$ 95,000,000
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| Gain on change of control of interests |
|
14,200,000
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$ 14,200,000
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|
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| Repayment of mortgage loans |
$ 95,000,000
|
|
|
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| Issuance of loan |
|
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37,400,000
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| Loan balance |
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14,000,000
|
|
14,000,000
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| Noncontrolling interest's fair value |
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$ 29,800,000
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$ 29,800,000
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