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)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
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, Lapsed or Cancelled
Shares Under Options - Outstanding, ending balance 800,000
Shares Under Options - Options exercisable 800,000
Shares Under Options - Available for grant 1,488,356
Weighted Average Exercise Price - Outstanding, beginning balance | $ / shares $ 17.31
Weighted Average Exercise Price - Granted, Lapsed or Cancelled | $ / shares
Weighted Average Exercise Price - Outstanding, ending balance | $ / shares $ 17.31
Aggregate Intrinsic Value, Outstanding, beginning balance | $ $ 3,400
Aggregate Intrinsic Value, Outstanding, ending balance | $ $ 2,376