Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Stock Options Plans) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Stock Options Plans) (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
May 31, 2013
2013 Incentive Stock Plan [Member]
May 31, 2004
2004 Incentive Stock Plan [Member]
Jun. 30, 2013
2013 And 2004 Incentive Stock Plans [Member]
Dec. 31, 1994
Employee And Director Plan [Member]
Jun. 30, 2013
Employee And Director Plan [Member]
Minimum [Member]
Jun. 30, 2013
Employee And Director Plan [Member]
Maximum [Member]
Jun. 30, 2013
2000 Employee Plan [Member]
Minimum [Member]
Jun. 30, 2013
2000 Employee Plan [Member]
Maximum [Member]
Jun. 30, 2013
2000 Director Plan [Member]
Minimum [Member]
Jun. 30, 2013
2000 Director Plan [Member]
Maximum [Member]
Jun. 30, 2013
Employee Plan [Member]
Dec. 31, 1994
Employee Plan [Member]
Dec. 31, 1994
Director Plan [Member]
Jun. 30, 2013
1994 And 1995 Employee Plans [Member]
Jun. 30, 2013
2000 Director Plan And Director Plan [Member]
Stock Option Activity [Line Items]                                        
Reserved stocks for issuance           4,600,000 2,500,000   5,380,188 2,700,000 4,350,000 2,500,000 4,000,000 200,000 350,000   4,980,188 400,000    
Shares issued               0                        
Exercisable time period                               5 years     3 years 1 year
Stock option terms     10 years                                  
Weighted average remaining contractual life     1 year 2 months 12 days   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