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 - Diluted 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 - Diluted 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]        
Net income (loss) from continuing operations available to common shareholders $ (78,061) $ (45,050) $ (102,905) $ (81,591)
Add (deduct): Noncontrolling interests in Operating Partnership (7,669) (4,527) (9,974) (8,089)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests in the Operating Partnership unitholders (155) (237) (334) (533)
Income (loss) from continuing operations for diluted earnings per share (85,885) (49,814) (113,213) (90,213)
Income (loss) from discontinued operations for diluted earnings per share 4,876 8,765 38,619 1,925
Net income (loss) available for diluted earnings per share $ (81,009) $ (41,049) $ (74,594) $ (88,288)
Weighted average common shares 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)
Mack-Cali Realty LP [Member]        
Stockholders Equity [Line Items]        
Net income (loss) from continuing operations available to common shareholders $ (85,885) $ (49,814) $ (113,213) $ (90,213)
Income (loss) from discontinued operations for diluted earnings per share 4,876 8,765 38,619 1,925
Net income (loss) available for diluted earnings per share $ (81,009) $ (41,049) $ (74,594) $ (88,288)
Weighted average common unit 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)