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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Stockolders Equity [Line Items]        
Net income (loss) $ (42,734) $ (22,479) $ (74,825) $ 244,887
Add (deduct): Noncontrolling interests in consolidated joint ventures 829 847 1,005 2,095
Add (deduct): Noncontrolling interests in Operating Partnership 4,626 2,647 8,292 (24,196)
Add (deduct): Redeemable noncontrolling interests (6,471) (5,006) (12,942) (9,673)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders (2,236) (16,759) (5,040) (19,911)
Income (loss) from continuing operations available to common shareholders (45,986) (40,750) (83,510) 193,202
Income (loss) from discontinued operations available to common shareholders 8,863 1,937 3,659 9,328
Net income (loss) available to common shareholders for basic earnings per share $ (37,123) $ (38,813) $ (79,851) $ 202,530
Weighted average common shares 90,629 90,533 90,622 90,516
Income (loss) from continuing operations available to common shareholders $ (0.51) $ (0.45) $ (0.92) $ 2.14
Income (loss) from discontinued operations available to common shareholders 0.10 0.02 0.04 0.10
Net income (loss) available to common shareholders $ (0.41) $ (0.43) $ (0.88) $ 2.24
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Net income (loss) $ (42,734) $ (22,479) $ (74,825) $ 244,887
Add (deduct): Noncontrolling interests in consolidated joint ventures 829 847 1,005 2,095
Add (deduct): Redeemable noncontrolling interests (6,471) (5,006) (12,942) (9,673)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders (2,473) (18,609) (5,573) (22,118)
Income (loss) from continuing operations available to common shareholders (50,849) (45,247) (92,335) 215,191
Income (loss) from discontinued operations available to common shareholders 9,800 2,150 4,047 10,378
Net income (loss) available to common shareholders for basic earnings per share $ (41,049) $ (43,097) $ (88,288) $ 225,569
Weighted average common units 100,213 100,523 100,198 100,631
Income (loss) from continuing operations available to common shareholders $ (0.51) $ (0.45) $ (0.92) $ 2.14
Income (loss) from discontinued operations available to common shareholders 0.10 0.02 0.04 0.10
Net income (loss) available to common shareholders $ (0.41) $ (0.43) $ (0.88) $ 2.24