Quarterly report pursuant to Section 13 or 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
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital [Abstract]    
Shares Under Options - Outstanding, beginning balance 800,000 800,000
Shares Under Options - Granted, Lapsed or Cancelled  
Shares Under Options - Outstanding, ending balance 800,000 800,000
Shares Under Options - Options exercisable 800,000 666,666
Shares Under Options - Available for grant 750,000 2,102,977
Weighted Average Exercise Price - Outstanding, beginning balance $ 17.31 $ 17.31
Weighted Average Exercise Price - Granted, Lapsed or Cancelled  
Weighted Average Exercise Price - Outstanding, ending balance $ 17.31 $ 17.31
Aggregate Intrinsic Value, Outstanding, beginning balance $ 1,824 $ 3,400
Aggregate Intrinsic Value, Outstanding, ending balance $ 3,912  
Outstanding stock option price $ 17.31 $ 17.31