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
 9 Months Ended
Jun. 05, 2015
Sep. 30, 2017
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital [Abstract]    
Shares Under Options - Outstanding, beginning balance   800,000
Shares Under Options - Granted 800,000  
Shares Under Options - Granted Lapsed or Cancelled  
Shares Under Options - Outstanding, ending balance   800,000
Shares Under Options - Options exercisable   666,666
Shares Under Options - Available for grant   2,069,064
Weighted Average Exercise Price - Outstanding, beginning balance   $ 17.31
Weighted Average Exercise Price - Granted, Lapsed or Cancelled  
Weighted Average Exercise Price - Outstanding, ending balance   $ 17.31
Aggregate Intrinsic Value, Outstanding, beginning balance   $ 9,368
Aggregate Intrinsic Value, Outstanding, ending balance   $ 5,120
Outstanding stock option price   $ 17.31