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
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Outstanding stock option price $ 17.31 $ 17.31 $ 17.31
2013 Incentive Stock Plan [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Shares Under Options - Outstanding, beginning balance 800,000 800,000 805,000
Shares Under Options - Granted, Lapsed or Cancelled    
Shares Under Options - Lapsed or Cancelled   (5,000)
Shares Under Options - Outstanding, ending balance 800,000 800,000 800,000
Shares Under Options - Options exercisable 800,000    
Shares Under Options - Available for grant 1,580,869    
Weighted Average Exercise Price - Outstanding, beginning balance $ 17.31 $ 17.31 $ 17.33
Weighted Average Exercise Price - Granted, Lapsed or Cancelled    
Weighted Average Exercise Price - Lapsed or Cancelled   21.25
Weighted Average Exercise Price - Outstanding, ending balance $ 17.31 $ 17.31 $ 17.31
Aggregate Intrinsic Value, Outstanding, beginning balance $ 3,400 $ 9,368 $ 4,843
Aggregate Intrinsic Value, Outstanding, ending balance $ 1,824 $ 3,400 $ 9,368