Mack-Cali Realty Corporation Stockholders' Equity (Earnings Per Share Tables - Diluted Computation of EPS) (Details) (USD $)
In Thousands, except Per Share data | 3 Months Ended | 9 Months Ended |
|---|
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 |
|---|
| Mack-Cali Realty Corporation Stockholders' Equity [Abstract] | | | | |
| Income from continuing operations available to common shareholders | $ 20,500 | $ 13,039 | $ 53,562 | $ 42,252 |
| Add: Noncontrolling interest in operating partnership | 3,015 | 2,150 | 8,031 | 7,047 |
| Income from continuing operations for diluted earnings per share | 23,515 | 15,189 | 61,593 | 49,299 |
| Income (loss) from discontinued operations for diluted earnings per share | | | | 4,689 |
| Net income available to common shareholders | $ 23,515 | $ 15,189 | $ 61,593 | $ 53,988 |
| Weighted average common shares | 99,917 | 92,464 | 98,631 | 92,467 |
| Income from continuing operations available to common shareholders | $ 0.24 | $ 0.16 | $ 0.62 | $ 0.53 |
| Income (loss) from discontinued operations available to common shareholders | | | | $ 0.05 |
| Net income available to common shareholders | $ 0.24 | $ 0.16 | $ 0.62 | $ 0.58 |