Annual report pursuant to Section 13 and 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Stock Option Plans) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Stock Option Plans) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]      
Shares Under Options - Outstanding, beginning balance 295,676 352,184 395,541
Shares Under Options - Exercised (107,806) (55,508) (18,917)
Shares Under Options - Lapsed or Cancelled (4,000) (1,000) (24,440)
Shares Under Options - Outstanding, ending balance 183,870 295,676 352,184
Weighted Average Exercise Price - Outstanding, beginning balance $ 29.05 $ 28.74 $ 28.77
Weighted Average Exercise Price - Exercised $ 28.27 $ 27.10 $ 26.66
Weighted Average Exercise Price - Lapsed or Cancelled $ 28.80 $ 26.75 $ 30.89
Weighted Average Exercise Price - Outstanding, ending balance $ 29.51 $ 29.05 $ 28.74
Aggregate Intrinsic Value, Outstanding, beginning balance $ 1,186    
Aggregate Intrinsic Value, Outstanding, ending balance   1,186  
Shares Under Options - Options exercisable 183,870 295,676  
Shares Under Options - Available for grant 2,343,337 2,425,073  
Option exercisable, Aggregate Intrinsic Value   $ 1,186  
Outstanding stock option price range, lower range $ 28.47 $ 26.31  
Outstanding stock option price range, upper range $ 45.47 $ 45.47