Annual report pursuant to Section 13 and 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 12 Months Ended
Feb. 18, 2011
Dec. 31, 2011
Oct. 28, 2011
Oct. 27, 2011
Jan. 05, 2011
Dec. 31, 2010
Stock Option Activity [Line Items]            
Maximum percentage of outstanding share owned by REIT   50.00%        
Preferred stock, shares outstanding   0   10,000 10,000 10,000
Amount of depositary shares converted from the preferred shares   1,000,000        
Depositary shares value, per share   $ 25        
One depositary share equivalent of one Series C Preferred Stock   1/100th        
Preferred stock, redemption price per share     $ 2,500      
Write off of preferred stock issuance costs     $ 164,000      
Net proceeds from common stock issuance 227,400,000          
Maximum cash investments   5,000        
Repurchase Of Equity [Member]
            
Stock Option Activity [Line Items]            
Capacity of share repurchase program   150,000,000        
Date share repurchase program was initiated           September 12, 2007
Stock repurchased and retired shares           2,893,630
Aggregate cost of stocks repurchased   104,000,000        
Capacity available for additional repurchase of outstanding common stock   $ 46,000,000        
Dividend Reinvestment And Stock Purchase Plan [Member]
            
Stock Option Activity [Line Items]            
Reserved stocks for issuance   5,500,000        
Common Stock [Member]
            
Stock Option Activity [Line Items]            
Shares of common stock issued in public offering 7,187,500