Segment Reporting (Schedule Of Reconciliation Of Net Operating Income To Net Income Available To Common Shareholders) (Details) - USD ($)
|
3 Months Ended |
6 Months Ended |
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
| Segment Reporting Information [Line Items] |
|
|
|
|
| Net operating income |
$ 36,211,000
|
$ 41,904,000
|
$ 75,738,000
|
$ 85,992,000
|
| Depreciation and amortization |
(49,352,000)
|
(41,413,000)
|
(97,398,000)
|
(82,710,000)
|
| Property impairments |
(5,802,000)
|
|
(5,802,000)
|
|
| Land impairment |
(2,499,000)
|
|
(2,499,000)
|
|
| Gain on change of control of interests |
|
|
13,790,000
|
|
| Realized gains (losses) and unrealized losses on disposition of rental property, net |
255,000
|
1,010,000
|
268,364,000
|
59,196,000
|
| Gain on disposition of developable land |
270,000
|
|
270,000
|
|
| Gain on sale of investment in unconsolidated joint venture |
|
|
903,000
|
|
| Gain (loss) from extinguishment of debt, net |
588,000
|
0
|
1,899,000
|
(10,289,000)
|
| Net income (loss) |
(20,329,000)
|
1,501,000
|
255,265,000
|
52,189,000
|
| Noncontrolling interests in consolidated joint ventures |
847,000
|
95,000
|
2,095,000
|
125,000
|
| Noncontrolling interests in Operating Partnership |
2,434,000
|
142,000
|
(25,246,000)
|
(4,741,000)
|
| Redeemable noncontrolling interests |
(5,006,000)
|
(2,989,000)
|
(9,673,000)
|
(5,788,000)
|
| Net income (loss) available to common shareholders |
(22,054,000)
|
(1,251,000)
|
222,441,000
|
41,785,000
|
| Mack-Cali Realty LP [Member] |
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
| Net operating income |
36,211,000
|
41,904,000
|
75,738,000
|
85,992,000
|
| Depreciation and amortization |
(49,352,000)
|
(41,413,000)
|
(97,398,000)
|
(82,710,000)
|
| Property impairments |
(5,802,000)
|
|
(5,802,000)
|
|
| Land impairment |
(2,499,000)
|
|
(2,499,000)
|
|
| Gain on change of control of interests |
|
|
13,790,000
|
|
| Realized gains (losses) and unrealized losses on disposition of rental property, net |
255,000
|
1,010,000
|
268,364,000
|
59,196,000
|
| Gain on disposition of developable land |
270,000
|
|
270,000
|
|
| Gain on sale of investment in unconsolidated joint venture |
|
|
903,000
|
|
| Gain (loss) from extinguishment of debt, net |
588,000
|
|
1,899,000
|
(10,289,000)
|
| Net income (loss) |
(20,329,000)
|
1,501,000
|
255,265,000
|
52,189,000
|
| Noncontrolling interests in consolidated joint ventures |
847,000
|
95,000
|
2,095,000
|
125,000
|
| Redeemable noncontrolling interests |
(5,006,000)
|
(2,989,000)
|
(9,673,000)
|
(5,788,000)
|
| Net income (loss) available to common shareholders |
$ (24,488,000)
|
$ (1,393,000)
|
$ 247,687,000
|
$ 46,526,000
|