Mack-Cali Realty Corporation Stockholders' Equity (Deferred Stock Compensation Plan For Directors) (Narrative) (Details) | 9 Months Ended | ||
|---|---|---|---|
Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010 | |
| Mack-Cali Realty Corporation Stockholders' Equity [Abstract] | |||
| Deferred stock units earned | 10,620 | 9,411 | |
| Deferred stock units outstanding | 93,773 | 84,236 | |