Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Deferred Stock Compensation Plan For Directors) (Narrative) (Details) - shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital [Abstract] | |||
| Maximum percentage of retainer fee that directors may defer | 100.00% | ||
| Deferred stock units earned | 19,728 | 14,274 | 19,702 |
| Deferred stock units outstanding | 210,738 | 193,711 | |