Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Stock Option Plans) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]
Shares Under Options - Outstanding, beginning balance	183,870
Shares Under Options - Lapsed or Cancelled	(168,870)
Shares Under Options - Outstanding, ending balance	15,000
Shares Under Options - Options exercisable	15,000
Shares Under Options - Available for grant	4,600,000
Weighted Average Exercise Price - Outstanding, beginning balance	$ 29.51
Weighted Average Exercise Price - Lapsed or Cancelled	$ 28.53
Weighted Average Exercise Price - Outstanding, ending balance	$ 40.54
Outstanding stock option price range, lower range	$ 35.59
Outstanding stock option price range, upper range	$ 45.47