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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stockolders Equity [Line Items]        
Net income (loss) $ 1,501 $ (39,125) $ 52,189 $ (16,396)
Add (deduct): Noncontrolling interest in consolidated joint ventures 95 181 125 418
Add (deduct): Noncontrolling interest in Operating Partnership 142 4,296 (4,741) 2,001
Add (deduct): Redeemable noncontrolling interest (2,989) (2,682) (5,788) (3,474)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders (3,379) (2,551) (6,133) (12,411)
Net income (loss) available to common shareholders for basic earnings per share $ (4,630) $ (39,881) $ 35,652 $ (29,862)
Weighted average common shares 90,330 90,011 90,297 89,983
Net income (loss) available to common shareholders $ (0.05) $ (0.44) $ 0.39 $ (0.33)
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Net income (loss) $ 1,501 $ (39,125) $ 52,189 $ (16,396)
Add (deduct): Noncontrolling interest in consolidated joint ventures 95 181 125 418
Add (deduct): Redeemable noncontrolling interest (2,989) (2,682) (5,788) (3,474)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders (3,763) (2,845) (6,830) (13,843)
Net income (loss) available to common shareholders for basic earnings per share $ (5,156) $ (44,471) $ 39,696 $ (33,295)
Weighted average common units 100,598 100,370 100,552 100,354
Net income (loss) available to common shareholders $ (0.05) $ (0.44) $ 0.39 $ (0.33)