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 - Basic 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 - Basic 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) $ (39,125) $ 54,366 $ (16,396) $ 123,135
Add (deduct): Noncontrolling interest in consolidated joint ventures 181 (311) 418 395
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 interests (2,551)   (12,411)  
Net income available to common shareholders (37,330) 48,393 (17,451) 110,584
Net income (loss) available to common shareholders for basic earnings per share $ (39,881) $ 48,393 $ (29,862) $ 110,584
Weighted average common shares 90,011 89,740 89,983 89,731
Weighted average common units     100,354 100,235
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) $ (39,125) $ 54,366 $ (16,396) $ 123,135
Add (deduct): Noncontrolling interest in consolidated joint ventures 181 (311) 418 395
Deduct: Redeemable noncontrolling interest (2,682)   (3,474)  
Deduct: Redemption value adjustment of redeemable noncontrolling interests (2,845)   (13,843)  
Net income available to common shareholders (41,626) 54,055 (19,452) 123,530
Net income (loss) available to common shareholders for basic earnings per share $ (44,471) $ 54,055 $ (33,295) $ 123,530
Weighted average common units 100,370 100,239 100,354 100,235
Net income (loss) available to common shareholders $ (0.44) $ 0.54 $ (0.33) $ 1.23