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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stockolders Equity [Line Items]        
Net income (loss) $ (20,329) $ 1,501 $ 255,265 $ 52,189
Add (deduct): Noncontrolling interests in consolidated joint ventures 847 95 2,095 125
Add (deduct): Noncontrolling interests in Operating Partnership 2,434 142 (25,246) (4,741)
Add (deduct): Redeemable noncontrolling interests (5,006) (2,989) (9,673) (5,788)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders (16,759) (3,379) (19,911) (6,133)
Net income (loss) available to common shareholders for basic earnings per share $ (38,813) $ (4,630) $ 202,530 $ 35,652
Weighted average common shares 90,533 90,330 90,516 90,297
Net income (loss) available to common shareholders $ (0.43) $ (0.05) $ 2.24 $ 0.39
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Net income (loss) $ (20,329) $ 1,501 $ 255,265 $ 52,189
Add (deduct): Noncontrolling interests in consolidated joint ventures 847 95 2,095 125
Add (deduct): Redeemable noncontrolling interests (5,006) (2,989) (9,673) (5,788)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders (18,609) (3,763) (22,118) (6,830)
Net income (loss) available to common shareholders for basic earnings per share $ (43,097) $ (5,156) $ 225,569 $ 39,696
Weighted average common units 100,523 100,598 100,631 100,552
Net income (loss) available to common shareholders $ (0.43) $ (0.05) $ 2.24 $ 0.39