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, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Shares Under Options - Granted 800,000        
2013 Incentive Stock Plan [Member]          
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Shares Under Options - Outstanding, beginning balance   800,000 800,000 800,000  
Shares Under Options - Granted, Lapsed or Cancelled   172,495      
Shares Under Options - Outstanding, ending balance   972,495 800,000 800,000 800,000
Shares Under Options - Options exercisable   972,495      
Shares Under Options - Available for grant   717,155      
Weighted Average Exercise Price - Outstanding, beginning balance   $ 17.31 $ 17.31 $ 17.31  
Weighted Average Exercise Price - Granted, Lapsed or Cancelled   14.39      
Weighted Average Exercise Price - Outstanding, ending balance   16.79 $ 17.31 $ 17.31 $ 17.31
Aggregate intrinsic value     $ 4,656 $ 1,824 $ 3,400
Outstanding stock option price     $ 17.31 $ 17.31 $ 17.31
Minimum [Member] | 2013 Incentive Stock Plan [Member]          
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Outstanding stock option price   14.39      
Maximum [Member] | 2013 Incentive Stock Plan [Member]          
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Outstanding stock option price   $ 17.31