Noncontrolling Interests In Subsidiaries (Narrative) (Details) - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
|
Mar. 31, 2019 |
Sep. 30, 2021 |
Dec. 31, 2020 |
| Noncontrolling Interest [Line Items] |
|
|
|
| Number of common shares received upon redemption of common units |
|
1
|
|
| Rebalance of ownership percentage |
|
$ 0.5
|
|
| Participation Rights [Member] |
|
|
|
| Noncontrolling Interest [Line Items] |
|
|
|
| Excess net cash flow remaining after the distribution to the Company |
|
50.00%
|
|
| Internal rate of return |
|
10.00%
|
|
| Mack-Cali Realty LP [Member] |
|
|
|
| Noncontrolling Interest [Line Items] |
|
|
|
| Percentage of noncontrolling interest |
|
9.00%
|
9.60%
|
| Flex Portfolio [Member] |
|
|
|
| Noncontrolling Interest [Line Items] |
|
|
|
| Redemption of common units, shares |
|
41,750
|
|
| Proceeds from sale of properties |
|
$ 0.7
|
|
| Disposal Group, Not Discontinued Operations [Member] | Flex Portfolio [Member] |
|
|
|
| Noncontrolling Interest [Line Items] |
|
|
|
| Redemption of common units, shares |
|
678,302
|
|
| Proceeds from sale of properties |
|
$ 10.5
|
|
| AO LTIP Units Award [Member] |
|
|
|
| Noncontrolling Interest [Line Items] |
|
|
|
| Exercisable period |
|
10 years
|
|
| AO LTIP Units Award [Member] | Messr DeMarco, CEO [Member] |
|
|
|
| Noncontrolling Interest [Line Items] |
|
|
|
| Shares granted |
625,000
|
|
|