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Mack-Cali Realty Corporation Stockholders' Equity (Earnings Per Share) (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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| Mack-Cali Realty Corporation Stockholders' Equity [Abstract] | ||||
| Unvested restricted stock outstanding | 352,358 | 105,843 | 352,358 | 105,843 |
| Dividends declared per common share | $ 0.30 | $ 0.45 | $ 0.75 | $ 0.90 |