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 Tables - Diluted Computation Of EPS) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share Tables - Diluted Computation Of EPS) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stockolders Equity [Line Items]        
Net income (loss) available to common shareholders for basic earnings per share $ (39,881) $ 48,393 $ (29,862) $ 110,584
Add (deduct): Noncontrolling interest in Operating Partnership (4,296) 5,662 (2,001) 12,946
Deduct: Redeemable noncontrolling interest (2,682)   (3,474)  
Deduct: Redemption value adjustment of redeemable noncontrolling interest in Operating Partnership (294)   (1,432)  
Net income (loss) for diluted earnings per share $ (44,471) $ 54,055 $ (33,295) $ 123,530
Weighted average common shares 100,370 100,401 100,354 100,359
Weighted average common unit     100,354 100,359
Net income (loss) available to common shareholders $ (0.44) $ 0.54 $ (0.33) $ 1.23
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Net income (loss) available to common shareholders for basic earnings per share $ (44,471) $ 54,055 $ (33,295) $ 123,530
Deduct: Redeemable noncontrolling interest (2,682)   (3,474)  
Net income (loss) for diluted earnings per share $ (44,471) $ 54,055 $ (33,295) $ 123,530
Weighted average common unit 100,370 100,401 100,354 100,359
Net income (loss) available to common shareholders $ (0.44) $ 0.54 $ (0.33) $ 1.23