Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Preferred And Common Stock And Repurchase Of General Partner Units) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Preferred And Common Stock And Repurchase Of General Partner Units) (Narrative) (Details) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended
Feb. 18, 2011
Sep. 30, 2011
Sep. 30, 2011
Oct. 05, 2011
Jan. 05, 2011
Dec. 31, 2010
Preferred stock, shares outstanding   10,000 10,000 10,000 10,000 10,000
Preferred stock, percentage     8.00%      
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      
Preferred stock, redemption price per share   $ 2,500 $ 2,500      
Series C preferred stock redemption value           $ 25,000,000
Write off of preferred stock issuance costs   164,000 164,000      
Shares of common stock issued in public offering 7,187,500          
Partner's capital amount, public sale of units net of offering price 227,400,000          
Capacity available for additional repurchase of outstanding common stock     46,000,000      
Series C Preferred Stock [Member]
            
Series C preferred stock redemption value   25,000,000 25,000,000      
Repurchase Of Equity [Member]
            
Capacity of share repurchase program     150,000,000      
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     $ 104,000,000