Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Stock Option Plans) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Stock Option Plans) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Jun. 05, 2015
Sep. 30, 2015
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]    
Shares Under Options - Outstanding, beginning balance   10,000
Shares under options - Granted 800,000 800,000
Shares Under Options - Outstanding, ending balance   805,000
Shares Under Options - Available for grant   3,416,456
Weighted Average Exercise Price - Outstanding, beginning balance   $ 33.36
Weighted Average Exercise Price - Exercised/Cancelled   5,000
Weighted Average Exercise Price - Granted   17.31
Weighted Average Exercise Price - Lapsed or Cancelled   45.47
Weighted Average Exercise Price - Outstanding, ending balance   $ 17.33
Aggregate Intrinsic Value, Outstanding, ending balance   $ 1,244
Outstanding stock option price range, lower range   $ 17.31
Outstanding stock option price range, upper range   $ 21.25