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Mack-Cali Realty Corporation Stockholders' Equity (Earnings Per Share) (Narrative) (Details) (USD $)
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3 Months Ended | 12 Months Ended | ||||||||||
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2010
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Sep. 30, 2010
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Jun. 30, 2010
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Mar. 31, 2010
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2008
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| Shareholders Equity [Line Items] | ||||||||||||
| Unvested restricted stock outstanding | 187,447 | 239,759 | 187,447 | 239,759 | 323,088 | 375,006 | ||||||
| Dividends declared per common share | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 1.80 | $ 1.8 | $ 1.8 | |
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Stock Options [Member]
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| Shareholders Equity [Line Items] | ||||||||||||
| Anti-dilutive securities | 15,000 | 15,000 | 307,184 | |||||||||
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Restricted Stock [Member]
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| Shareholders Equity [Line Items] | ||||||||||||
| Unvested restricted stock outstanding | 187,447 | 239,759 | 187,447 | 239,759 | 323,088 | |||||||