Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Restricted Stock Awards) (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2014
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Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares, Outstanding, Beginning balance 153,560 [1]  
Shares, Granted 208,589 [2]  
Shares, Vested (183,214)  
Shares, Forfeited (119)  
Shares, Outstanding, Ending balance 178,816 153,560 [1]
Weighted-Average Grant-Date Fair Value, Outstanding beginning balance $ 25.20 [1]  
Weighted-Average Grant-Date Fair Value, Granted $ 20.83 [2]  
Weighted-Average Grant-Date Fair Value, Vested $ 22.37  
Weighted-Average Grant-Date Fair Value, Forfeited $ 26.36  
Weighted-Average Grant-Date Fair Value, Outstanding ending balance $ 23.00 $ 25.20 [1]
Unvested performance shares 42,000 63,933
Number of executive officers who departed 2  
Executive Officer [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares, Granted 87,734  
[1] Includes 63,933 Performance Shares which were legally granted in 2013 for which the 2013 performance goals were not met, which may be earned if subsequent years’ performance goals are met.
[2] Includes 42,000 Performance Shares which were legally granted in 2013 for which the 2014 performance goals were set by the Committee on March 31, 2014. Also includes 87,734 shares which were additionally granted to two executive officers in connection with their departure affective March 31, 2014 and which vested on April 1, 2014.