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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Stockholders Equity [Line Items]        
Income (loss) from continuing operations $ (78,907) $ (41,699) $ (99,129) $ (72,703)
Add (deduct): Noncontrolling interests in consolidated joint ventures 1,198 829 2,533 1,005
Add (deduct): Noncontrolling interests in Operating Partnership 7,669 4,527 9,974 8,089
Add (deduct): Redeemable noncontrolling interests (6,471) (6,471) (12,942) (12,942)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders (1,550) (2,236) (3,341) (5,040)
Income (loss) from continuing operations available to common shareholders (78,061) (45,050) (102,905) (81,591)
Income (loss) from discontinued operations available to common shareholders 4,432 7,927 35,108 1,740
Net income (loss) available to common shareholders for basic earnings per share $ (73,629) $ (37,123) $ (67,797) $ (79,851)
Weighted average common shares 90,774 90,629 90,733 90,622
Income (loss) from continuing operations available to common shareholders $ (0.86) $ (0.50) $ (1.13) $ (0.90)
Income (loss) from discontinued operations available to common shareholders 0.05 0.09 0.38 0.02
Net income (loss) available to common shareholders $ (0.81) $ (0.41) $ (0.75) $ (0.88)
Mack-Cali Realty LP [Member]        
Stockholders Equity [Line Items]        
Income (loss) from continuing operations $ (78,907) $ (41,699) $ (99,129) $ (72,703)
Add (deduct): Noncontrolling interests in consolidated joint ventures 1,198 829 2,533 1,005
Add (deduct): Redeemable noncontrolling interests (6,471) (6,471) (12,942) (12,942)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders (1,705) (2,473) (3,675) (5,573)
Income (loss) from continuing operations available to common shareholders (85,885) (49,814) (113,213) (90,213)
Income (loss) from discontinued operations available to common shareholders 4,876 8,765 38,619 1,925
Net income (loss) available to common shareholders for basic earnings per share $ (81,009) $ (41,049) $ (74,594) $ (88,288)
Weighted average common units 99,873 100,213 99,817 100,198
Income (loss) from continuing operations available to common shareholders $ (0.86) $ (0.50) $ (1.13) $ (0.90)
Income (loss) from discontinued operations available to common shareholders 0.05 0.09 0.38 0.02
Net income (loss) available to common shareholders $ (0.81) $ (0.41) $ (0.75) $ (0.88)