Recent Transactions (Consolidation) (Narrative) (Details)
$ in Thousands |
|
|
1 Months Ended |
6 Months Ended |
|
|
|
Feb. 28, 2017
USD ($)
ft²
item
shares
|
Feb. 03, 2017
USD ($)
shares
|
Apr. 30, 2017
USD ($)
shares
|
Jun. 30, 2017
USD ($)
|
Jun. 30, 2016
USD ($)
|
Feb. 02, 2017 |
Dec. 31, 2016
USD ($)
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
|
|
| Business acquisition, cash paid |
|
|
|
$ 2,000
|
|
|
|
| Acquisition cost |
|
|
|
11,422
|
$ 23,657
|
|
|
| Consolidated joint ventures, total real estate assets |
|
|
|
$ 162,400
|
|
|
$ 201,900
|
| Percentage of ownership interest |
|
|
|
89.60%
|
|
|
89.50%
|
| Series A-1 Units [Member] |
|
|
|
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
|
|
| Percentage of ownership interest |
29.00%
|
|
|
|
|
|
|
| Mack-Cali Realty LP [Member] |
|
|
|
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
|
|
| Business acquisition, cash paid |
|
|
|
$ 2,000
|
|
|
|
| Acquisition cost |
|
|
|
11,422
|
$ 23,657
|
|
|
| Mack-Cali Realty LP [Member] | Series A Units [Member] |
|
|
|
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
|
|
| Preferred units shares issued | shares |
|
42,800
|
|
|
|
|
|
| Percentage of interest in venture |
|
37.50%
|
|
|
|
|
|
| Preferred unit annual rate |
|
3.50%
|
|
|
|
|
|
| Preferred units aggregate amount |
|
$ 42,800
|
|
|
|
|
|
| Mack-Cali Realty LP [Member] | Series A-1 Units [Member] |
|
|
|
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
|
|
| Preferred units shares issued | shares |
9,213
|
|
91
|
|
|
|
|
| Percentage of interest in venture |
13.80%
|
|
|
|
|
|
|
| Preferred unit annual rate |
3.50%
|
|
|
|
|
|
|
| Plaza VIII & IX Associates, L.L.C. [Member] |
|
|
|
|
|
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| Real Estate Properties [Line Items] |
|
|
|
|
|
|
|
| Percentage of interest in venture |
|
|
|
|
|
50.00%
|
|
| Percentage of additional interest acquired |
|
12.50%
|
|
|
|
|
|
| Acquisition cost |
|
$ 14,300
|
|
|
|
|
|
| Consolidated joint ventures, total real estate assets |
|
$ 60,600
|
|
|
|
|
|
| Monaco Towers [Member] |
|
|
|
|
|
|
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| Real Estate Properties [Line Items] |
|
|
|
|
|
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| Number of towers | item |
2
|
|
|
|
|
|
|
| Net assets acquired |
|
|
|
$ 139,886
|
|
|
|
| Garage Parking Spaces | item |
558
|
|
|
|
|
|
|
| Number of stories | item |
50
|
|
|
|
|
|
|
| Area of property (in square feet) | ft² |
12,300
|
|
|
|
|
|
|
| Number of units | item |
523
|
|
|
|
|
|
|
| Monaco Towers [Member] | Series A-1 Units [Member] |
|
|
|
|
|
|
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| Real Estate Properties [Line Items] |
|
|
|
|
|
|
|
| Percentage of interest in venture |
13.80%
|
|
|
|
|
|
|
| Monaco Towers [Member] | Mack-Cali Realty LP [Member] | Series A-1 Units [Member] |
|
|
|
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
|
|
| Preferred units shares issued | shares |
9,122
|
|
|
|
|
|
|
| Preferred units aggregate amount |
$ 9,100
|
|
|
|
|
|
|
| Acquisition cost |
|
|
$ 130,900
|
|
|
|
|
| Debt assumed |
|
|
$ 171,200
|
|
|
|
|
| Percentage of interest in venture |
|
|
71.20%
|
|
100.00%
|
|
|