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Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Restricted Stock Awards) (Details) (USD $)
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3 Months Ended |
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Mar. 31, 2015
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Shares, Outstanding, Beginning balance | 346,946 |
| Shares, Granted | 3,786 |
| Shares, Vested | (37,392) |
| Shares, Forfeited | (3) |
| Shares, Outstanding, Ending balance | 313,337 |
| Weighted-Average Grant-Date Fair Value, Outstanding beginning balance | $ 21.09 |
| Weighted-Average Grant-Date Fair Value, Granted | $ 19.53 |
| Weighted-Average Grant-Date Fair Value, Vested | $ 21.59 |
| Weighted-Average Grant-Date Fair Value, Forfeited | $ 26.36 |
| Weighted-Average Grant-Date Fair Value, Outstanding ending balance | $ 21.01 |
| Number of executive officers who departed | 2 |