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) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Anti-dilutive securities excluded from the computation of earnings per share     0 410,000  
Dividends declared per common share $ 0.15 $ 0.15 $ 0.30 $ 0.30  
Unvested restricted stock outstanding 111,436   111,436   136,220
Unvested Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested restricted stock outstanding 86,403 103,337 86,403 103,337