Annual report pursuant to Section 13 and 15(d)

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Stock Option Plans) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Stock Option Plans) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 05, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Shares Under Options - Granted 800,000      
Outstanding stock option price range, lower range     $ 17.23 $ 21.25
Outstanding stock option price range, upper range     $ 21.25 $ 45.47
Outstanding stock option price   $ 17.31    
2013 Incentive Stock Plan [Member]        
Shares Under Options - Outstanding, beginning balance   805,000 10,000 15,000
Shares Under Options - Granted     800,000 5,000
Shares Under Options - Lapsed or Cancelled   (5,000) (5,000) (10,000)
Shares Under Options - Outstanding, ending balance   800,000 805,000 10,000
Shares Under Options - Options exercisable   533,334    
Shares Under Options - Available for grant   2,695,978    
Weighted Average Exercise Price - Outstanding, beginning balance   $ 17.33 $ 33.36 $ 40.54
Weighted Average Exercise Price - Granted     17.31 21.25
Weighted Average Exercise Price - Lapsed or Cancelled   21.25 45.47 38.07
Weighted Average Exercise Price - Outstanding, ending balance   $ 17.31 $ 17.33 $ 33.36
Aggregate Intrinsic Value, Outstanding, beginning balance   $ 4,843    
Aggregate Intrinsic Value, Outstanding, ending balance   $ 9,368 $ 4,843