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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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Jun. 30, 2012
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Jun. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||||
| Unvested restricted stock outstanding | 105,843 | 187,447 | |||
| Dividends declared per common share | $ 0.45 | $ 0.45 | $ 1.35 | $ 1.35 | |
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Restricted Stock [Member]
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||||
| Unvested restricted stock outstanding | 105,843 | 157,681 | |||