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Mack-Cali Realty Corporation Stockholders' Equity (Stock Compensation) (Narrative) (Details) (USD $)
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9 Months Ended | 9 Months Ended | 1 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2012
Maximum [Member]
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Sep. 30, 2012
Minimum [Member]
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Sep. 30, 2012
Restricted Stock [Member]
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Sep. 30, 2011
Restricted Stock [Member]
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Sep. 30, 2012
Ratified Restricted Stock Awards [Member]
Maximum [Member]
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Sep. 30, 2012
Ratified Restricted Stock Awards [Member]
Minimum [Member]
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Sep. 30, 2012
Total Stockholder Return Based Awards [Member]
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Jan. 31, 2013
Scenario, Forecast [Member]
Ratified Restricted Stock Awards [Member]
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Jan. 31, 2013
Scenario, Forecast [Member]
Total Stockholder Return Based Awards [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||
| Restricted Stock Award vesting period | 7 years | 1 year | 7 years | 5 years | 5 years | ||||||
| Unvested restricted stock outstanding | 105,843 | 187,447 | 105,843 | 157,681 | |||||||
| Restricted stock awards unvested shares outstanding performance contingent | 40,877 | ||||||||||
| Awards issued | 319,667 | 5,160 | |||||||||
| Value of common stock received upon vesting of awards | $ 1,000 | ||||||||||