Quarterly report pursuant to Section 13 or 15(d)

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

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share/Unit) (Narrative) (Details) - $ / shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested restricted stock outstanding 74,413   108,318
Dividends declared per common share $ 0.20 $ 0.15  
Mack-Cali Realty LP [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividends declared per common share $ 0.20 $ 0.15  
Unvested Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested restricted stock outstanding 61,896 37,752  
Unvested Restricted Stock [Member] | Mack-Cali Realty LP [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested restricted stock outstanding 61,896 37,752