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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, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||
| Anti-dilutive securities excluded from the computation of earnings per share | 15,000 | 10,000 | ||||||
| Dividends declared per common share | $ 0.15 | $ 0.30 | $ 0.45 | $ 0.60 | ||||
| Unvested restricted stock outstanding | 178,816 | 178,816 | 153,560 | [1] | ||||
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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 | 304,816 | 352,358 | 304,816 | 352,358 | ||||
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