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Mack-Cali Realty Corporation Stockholders' Equity (Stock Options Plans) (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 12 Months Ended | 6 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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May 31, 2013
2013 Incentive Stock Plan [Member]
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Jun. 30, 2014
2004 Incentive Stock Plan [Member]
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May 31, 2004
2004 Incentive Stock Plan [Member]
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Jun. 30, 2014
Employee And Director Plan [Member]
Minimum [Member]
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Jun. 30, 2014
Employee And Director Plan [Member]
Maximum [Member]
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Jun. 30, 2014
2000 Employee Plan [Member]
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Jun. 30, 2014
2000 Employee Plan [Member]
Minimum [Member]
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Jun. 30, 2014
2000 Employee Plan [Member]
Maximum [Member]
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Jun. 30, 2014
2000 Director Plan [Member]
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Jun. 30, 2014
2000 Director Plan [Member]
Minimum [Member]
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Jun. 30, 2014
2000 Director Plan [Member]
Maximum [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 | 5 years 4 months 24 days | 8 months 12 days | ||||||||||||||
| Share price | $ 1.71 | $ 1.71 | ||||||||||||||
| Proceeds from stock options exercised | $ 0 | $ 0 | $ 0 | $ 0 | ||||||||||||
| Total intrinsic value of options exercised | 0 | 0 | 0 | 0 | ||||||||||||
| Stock options expense | $ 1,000 | $ 0 | $ 2,000 | $ 0 | ||||||||||||