Annual report pursuant to Section 13 and 15(d)

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share/Unit) (Narrative) (Details)

v3.8.0.1
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share/Unit) (Narrative) (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Anti-dilutive securities excluded from the computation of earnings per share     405,000  
Unvested restricted stock outstanding 108,318 145,278 136,220 346,946
Dividends declared per common share $ 0.75 $ 0.60 $ 0.60  
Mack-Cali Realty LP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Anti-dilutive securities excluded from the computation of earnings per share     405,000  
Distribution declared per common unit $ 0.75 $ 0.60 $ 0.60  
Unvested Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested restricted stock outstanding 95,801 120,245 98,669  
Unvested Restricted Stock [Member] | Mack-Cali Realty LP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested restricted stock outstanding 95,801 120,245 98,669