Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Earnings Per Share) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Earnings Per Share) (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested restricted stock outstanding 95,858   95,858   134,328
Dividends declared per common share $ 0.30 $ 0.45 $ 1.05 $ 1.35  
Restricted Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested restricted stock outstanding 351,592 105,843 351,592 105,843