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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Outstanding stock option price $ 17.31 $ 17.31 $ 17.31  
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 - Outstanding, ending balance 800,000 800,000 800,000  
Shares Under Options - Options exercisable 800,000      
Shares Under Options - Available for grant 709,246      
Weighted Average Exercise Price - Outstanding, beginning balance $ 17.31 $ 17.31 $ 17.31  
Weighted Average Exercise Price - Outstanding, ending balance $ 17.31 $ 17.31 $ 17.31  
Aggregate intrinsic value $ 4,656 $ 1,824 $ 3,400 $ 9,368