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Mack-Cali Realty Corporation Stockholders' Equity (Stock Options Plans) (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 12 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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May 31, 2013
2013 Incentive Stock Plan [Member]
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May 31, 2004
2004 Incentive Stock Plan [Member]
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Sep. 30, 2013
2013 And 2004 Incentive Stock Plans [Member]
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Sep. 30, 2013
Employee And Director Plan [Member]
Minimum [Member]
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Sep. 30, 2013
Employee And Director Plan [Member]
Maximum [Member]
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Sep. 30, 2013
2000 Employee Plan [Member]
Minimum [Member]
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Sep. 30, 2013
2000 Employee Plan [Member]
Maximum [Member]
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Sep. 30, 2013
2000 Director Plan [Member]
Minimum [Member]
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Sep. 30, 2013
2000 Director Plan [Member]
Maximum [Member]
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Sep. 30, 2013
Employee Plan [Member]
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Sep. 30, 2013
2000 Director Plan And Director Plan [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||
| Reserved stocks for issuance | 4,600,000 | 2,500,000 | 2,700,000 | 4,350,000 | 2,500,000 | 4,000,000 | 200,000 | 350,000 | ||||||||
| Shares issued | 0 | |||||||||||||||
| Exercisable time period | 5 years | 1 year | ||||||||||||||
| Stock option terms | 10 years | |||||||||||||||
| Weighted average remaining contractual life | 1 year | 1 month 6 days | ||||||||||||||
| Proceeds from stock options exercised | $ 0 | $ 0 | $ 0 | $ 0 | ||||||||||||
| Total intrinsic value of options exercised | 0 | 0 | 0 | 0 | ||||||||||||
| Stock options expense | $ 0 | $ 0 | $ 0 | $ 0 | ||||||||||||