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Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Stock Option Plans) (Details) (USD $)
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6 Months Ended |
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Jun. 30, 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 | (10,000) |
| Shares Under Options - Outstanding, ending balance | 10,000 |
| Shares Under Options - Options exercisable | 5,000 |
| Shares Under Options - Available for grant | 4,466,143 |
| Weighted Average Exercise Price - Outstanding, beginning balance | $ 40.54 |
| Weighted Average Exercise Price - Granted | $ 21.25 |
| Weighted Average Exercise Price - Lapsed or Cancelled | $ 38.07 |
| Weighted Average Exercise Price - Outstanding, ending balance | $ 33.36 |
| Outstanding stock option price range, lower range | $ 21.25 |
| Outstanding stock option price range, upper range | $ 45.47 |