Annual report pursuant to Section 13 and 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 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Anti-dilutive securities excluded from the computation of earnings per share                 405,000 10,000 15,000  
Dividends declared per common share $ 0.15 $ 0.15 $ 0.15 $ 0.15 $ 0.15 $ 0.15 $ 0.15 $ 0.30 $ 0.60 $ 0.75 $ 1.35  
Unvested restricted stock outstanding 136,220       346,946       136,220 346,946 153,560 134,328
Unvested Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Unvested restricted stock outstanding 98,669       136,946       98,669 136,946 409,294