Recent Transactions (Consolidations) (Narrative) (Details)
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1 Months Ended |
12 Months Ended |
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Aug. 02, 2018
USD ($)
item
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Feb. 28, 2017
USD ($)
ft²
item
shares
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Feb. 03, 2017
USD ($)
shares
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Apr. 30, 2017
USD ($)
shares
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Dec. 31, 2018
USD ($)
item
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Dec. 31, 2017
USD ($)
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Dec. 31, 2016
USD ($)
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Aug. 01, 2018
USD ($)
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Feb. 27, 2017 |
Feb. 02, 2017 |
| Real Estate Properties [Line Items] |
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| Acquisition cost |
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$ 11,789,000
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$ 36,060,000
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$ 35,930,000
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| Consolidated joint ventures, total real estate assets |
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$ 480,400,000
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215,500,000
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| Net assets acquired |
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$ 394,589,000
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| Percentage of ownership interest |
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89.80%
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89.60%
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| Number of units | item |
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1,317
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| Purchase price of property |
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$ 168,398,000
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$ 90,068,000
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121,582,000
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| Gain on sale of investment in unconsolidated joint venture |
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23,131,000
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5,670,000
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| Mortgage loan |
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45,242,000
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45,734,000
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| Gain on change of control of interests |
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14,217,000
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15,347,000
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| Issuance of loan |
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30,400,000
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| Loan balance |
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2,792,651,000
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2,809,568,000
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| Noncontrolling interest's fair value |
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210,523,000
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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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| Acquisition cost |
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11,789,000
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36,060,000
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35,930,000
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| Purchase price of property |
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168,398,000
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90,068,000
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121,582,000
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| Gain on sale of investment in unconsolidated joint venture |
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$ 23,131,000
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5,670,000
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| Gain on change of control of interests |
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14,217,000
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$ 15,347,000
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| Plaza VIII & IX Associates, L.L.C. [Member] |
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| Real Estate Properties [Line Items] |
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| Percentage of interest in venture |
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50.00%
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| Percentage of additional interest acquired |
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12.50%
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| Acquisition cost |
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$ 14,300,000
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| Consolidated joint ventures, total real estate assets |
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$ 60,600,000
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| Monaco [Member] |
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| Real Estate Properties [Line Items] |
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| Number of towers | item |
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2
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| Net assets acquired |
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$ 139,886,000
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| Garage Parking Spaces | item |
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558
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| Number of stories | item |
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50
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| Area of property (in square feet) | ft² |
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12,300
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| Number of units | item |
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523
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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 |
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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 |
$ 131,000,000
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$ 95,000,000
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| Gain on change of control of interests |
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$ 14,200,000
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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
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| Noncontrolling interest's fair value |
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$ 29,800,000
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| Series A Units [Member] | Mack-Cali Realty LP [Member] |
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| Real Estate Properties [Line Items] |
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| Preferred units shares issued | shares |
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42,800
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| Percentage of interest in venture |
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37.50%
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| Preferred unit annual rate |
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3.50%
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| Preferred units aggregate amount |
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$ 42,800,000
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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 |
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29.00%
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| Series A-1 Units [Member] | Mack-Cali Realty LP [Member] |
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| Real Estate Properties [Line Items] |
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| Preferred units shares issued | shares |
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9,213
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91
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| Percentage of interest in venture |
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13.80%
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| Preferred unit annual rate |
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3.50%
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| Series A-1 Units [Member] | Monaco [Member] |
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| Real Estate Properties [Line Items] |
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| Percentage of interest in venture |
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29.00%
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13.80%
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| Series A-1 Units [Member] | Monaco [Member] | Mack-Cali Realty LP [Member] |
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| Real Estate Properties [Line Items] |
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| Preferred units shares issued | shares |
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9,122
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91
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| Percentage of interest in venture |
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71.20%
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| Preferred units aggregate amount |
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$ 9,100,000
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| Acquisition cost |
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$ 130,900,000
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| Debt assumed |
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$ 171,200,000
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