Annual report pursuant to Section 13 and 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 $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
2004 Incentive Stock Plan [Member]
May 31, 2004
2004 Incentive Stock Plan [Member]
Dec. 31, 1994
Employee And Director Plan [Member]
Dec. 31, 2012
Employee And Director Plan [Member]
Minimum [Member]
Dec. 31, 2012
Employee And Director Plan [Member]
Maximum [Member]
Dec. 31, 2012
2000 Employee Plan [Member]
Minimum [Member]
Dec. 31, 2012
2000 Employee Plan [Member]
Maximum [Member]
Dec. 31, 2012
2000 Director Plan [Member]
Minimum [Member]
Dec. 31, 2012
2000 Director Plan [Member]
Maximum [Member]
Dec. 31, 2012
Employee Plan [Member]
Dec. 31, 1994
Employee Plan [Member]
Dec. 31, 1994
Director Plan [Member]
Dec. 31, 2012
1994 And 1995 Employee Plans [Member]
Dec. 31, 2012
2000 Director Plan And Director Plan [Member]
Stock Option Activity [Line Items]                                  
Reserved stocks for issuance         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 month 6 days 1 year 1 month 6 days                              
Proceeds from stock options exercised $ 0 $ 3,048,000 $ 1,504,000                            
Total intrinsic value of options exercised 0 496,000 349,000                            
Total unrecognized compensation cost $ 700,000                                
Total unrecognized compensation cost, period of recognition 1 year