Mack-Cali Realty Corporation Stockholders' Equity (Stock Compensation) (Details) (USD $) | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
Oct. 05, 2011 | Sep. 30, 2011 | Jan. 05, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Sep. 30, 2011
Restricted Stock [Member] | Sep. 30, 2011
Contingently Issuable Shares [Member] | |
| Restricted Stock Award vesting period, minimum (years) | 1 | ||||||
| Restricted Stock Award vesting period, maximum (years) | 7 | ||||||
| Common stock, shares outstanding | 87,142,004 | 87,141,716 | 79,605,542 | 79,605,474 | |||
| Restricted stock awards unvested shares outstanding performance contingent | 98,524 | ||||||
| Outstanding at January 1, 2011 | 157,681 | 216,802 | 239,759 | ||||
| Vested | (82,078) | ||||||
| Outstanding at September 30, 2011 | 157,681 | 216,802 | 157,681 | ||||
| Outstanding at January 1, 2011 | $ 35.90 | ||||||
| Vested | $ 37.01 | ||||||
| Outstanding at September 30, 2011 | $ 35.32 |