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 ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 05, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]        
Shares Under Options - Outstanding, beginning balance   10,000 15,000 183,870
Shares Under Options - Granted 800,000 800,000 5,000  
Shares Under Options - Lapsed or Cancelled   (5,000) (10,000)  
Shares Under Options - Exercised/Cancelled       (168,870)
Shares Under Options - Outstanding, ending balance   805,000 10,000 15,000
Shares Under Options - Available for grant   3,416,581    
Weighted Average Exercise Price - Outstanding, beginning balance   $ 33.36 $ 40.54 $ 29.51
Weighted Average Exercise Price - Granted   17.31 21.25  
Weighted Average Exercise Price - Lapsed or Cancelled   45.47 38.07 28.53
Weighted Average Exercise Price - Outstanding, ending balance   $ 17.33 33.36 40.54
Aggregate Intrinsic Value, Outstanding, ending balance   $ 4,843    
Outstanding stock option price range, lower range   $ 17.23 21.25 35.59
Outstanding stock option price range, upper range   $ 21.25 $ 45.47 $ 45.47