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Mack-Cali Realty Corporation Stockholders' Equity (Earnings Per Share) (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | |||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Unvested restricted stock outstanding | 95,858 | 95,858 | 134,328 | ||
| Dividends declared per common share | $ 0.30 | $ 0.45 | $ 1.05 | $ 1.35 | |
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Restricted Stock [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Unvested restricted stock outstanding | 351,592 | 105,843 | 351,592 | 105,843 | |