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Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Stock Option Plans) (Details) (USD $)
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3 Months Ended |
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Mar. 31, 2014
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| Mack-Cali Realty Corporation Stockholders' Equity [Abstract] | |
| Shares Under Options - Outstanding, beginning balance | 15,000 |
| Shares Under Options - Granted | 5,000 |
| Shares Under Options - Lapsed or Cancelled | (5,000) |
| Shares Under Options - Outstanding, ending balance | 15,000 |
| Shares Under Options - Options exercisable | 10,000 |
| Shares Under Options - Available for grant | 4,460,505 |
| Weighted Average Exercise Price - Outstanding, beginning balance | $ 40.54 |
| Weighted Average Exercise Price - Granted | $ 21.25 |
| Weighted Average Exercise Price - Lapsed or Cancelled | $ 40.55 |
| Weighted Average Exercise Price - Outstanding, ending balance | $ 34.10 |
| Outstanding stock option price range, lower range | $ 21.25 |
| Outstanding stock option price range, upper range | $ 45.47 |