Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Preferred Stock And Share Repurchase Program) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Preferred Stock And Share Repurchase Program) (Narrative) (Details) (USD $)
In Millions, except Share data
 6 Months Ended 12 Months Ended 48 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2011
Preferred stock, shares outstanding 10,000 10,000 10,000
Amount of depositary shares converted from the preferred shares 1,000,000   1,000,000
Depositary shares value, per share $ 25   $ 25
One depositary share equivalent of one Series C Preferred Stock 1/100th   1/100th
Dividends in arrears $ 0    
Capacity available for additional repurchase of outstanding common stock $ 46    
Repurchase Of Equity [Member]
      
Capacity of share repurchase program 150    
Date share repurchase program was initiated September 12, 2007   September 12, 2007
Stock repurchased and retired shares 2,893,630   2,893,630
Aggregate cost of stocks repurchased $ 0 $ 0 $ 104