Recent Transactions (Consolidation) (Narrative) (Details) - USD ($) $ in Thousands |
3 Months Ended | ||||
|---|---|---|---|---|---|
Feb. 03, 2017 |
Mar. 31, 2017 |
Mar. 31, 2016 |
Feb. 02, 2017 |
Dec. 31, 2016 |
|
| Real Estate Properties [Line Items] | |||||
| Acquisition cost | $ 6,625 | $ 7,225 | |||
| Consolidated joint ventures, total real estate assets | 211,300 | $ 201,900 | |||
| Mack-Cali Realty LP [Member] | |||||
| Real Estate Properties [Line Items] | |||||
| Acquisition cost | $ 6,625 | $ 7,225 | |||
| Mack-Cali Realty LP [Member] | Series A Units [Member] | |||||
| Real Estate Properties [Line Items] | |||||
| Preferred units shares issued | 42,800 | ||||
| Percentage of interest in venture | 37.50% | ||||
| Preferred unit annual rate | 3.50% | ||||
| Preferred units aggregate amount | $ 42,800 | ||||
| Plaza VIII & IX Associates, L.L.C. [Member] | |||||
| 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 | ||||